what other meds have you tried?
do you feel that the tenex dose may be too high? Do you know that you can break the pills in half? We do for our son when he needs an extra dose but not a full one.
I have no experience with aspergers but I understand what you are saying.
My son is full blown adHHHHd. He takes concerta AND tenex. They help him make it through his day. He is now turning 13 and we began meds 7 years ago and they have really saved his life.
I think if he is only on tenex, that he needs a stimulant to help. Can you start the trial and error process with school ending for the summer? This is the best time while he is home with you to keep an eye on and feel better about it.
Please take some time to relax or do something for you. I completely understand how overwhelming all of this is. I have no one to talk to except here on the boards. It can be quite lonely.
Please come to these boards and find the place that is best to help you. The parents/children threads are wonderful.

Hey there,
Son has taken aderall before with horrible side effects of tics it was a low does as well. He has extra heart beats too, so between that and the tics it was decided he cannot handle stimulants. We saw the psychiatrist yesterday right after seeing behavior therapist who could really not do much because ds is so off, and he lowered the dose for us. We are supposed to see him again in a couple weeks and he wants to start ds on a low risperidone. I feel like my hearts gonna jump out of my chest I hate medicating him. Yesterday afternoon I have him just one pill of tenex and he pretty much acted the same way so Im not sure if it takes a week or so to get back to the norm. I took him to my 4 yr olds baseball game, and it was really hard he kept talking very loudly saying some of the kids were better than him at baseball, and repeating what the coaches were saying very loudly so all could hear, but when he said it , it sounded like he was mocking the kids or heckling kind of. He kept laughing in a loud unatural way for longer than nessisary like if a kid would run to the wrong base or something. Its very embarassing when he acts this way, and a huge turn off when other parents see it, they dont want to be around us. He didnt want to shower when we got home which is usually not such a battle and complain and cried he couldnt watch tv ( it was a school night). I hope we see some changes soon, I'm considering going to my own doctor for anxiety soon not sure how much more of this I can deal with and keep my cool. I dont have others to talk to about this either finding this board has been a huge help so far im very thankful for it :)
I wonder if he has sensory integration as well? My son does. But sometimes the symptoms are very similar to just plain old adhd, so not sure.
My son couldn't handle adderal xr either. he had a psychotic fit/meltdown in the pediatrian's office and it was stopped at that moment.
He has done awesome with the "other" family of stimulants, concerta. This is part of the ritalin family.
I don't remember the correct name, but adderall xr is with the "opposite" family.
It seems, and I have learned from these boards and asking my doctor ?'s, that you either can handle on or the other.
SO, I guess I wonder if your son would be better with concerta/ritalin? It is worth a shot, can't get any worse, if you know what I mean.
What you describe from last night, I have been there personally as well. I dreaded those. That is very adHHHHHd, just like my son. ANd they are years behind socially/maturity as well. :(
So it makes them easy pickens for the bullies and ignorants. 
Hang in there, we are here for you!!
I am not aware of how different "familys" of stimulants work, but with his extra heart beats I want to stay on the safe side, although I may tuck it into my notes to ask doctor about. I just know the week he was on aderall he had serious issues with tics that we never even dealt with before, he has some tics with the tenex but not as bad as the adderal. I would think stimulants would get his heart going faster. This am he was somewhat worked up but managed to get out the door on time with constant redirecting, I asked him to vaccum just one rug for me and he did that and a couple extra, really fast but hey at least he was willing to help I appreciate all the help i can get! He complained alot about it too but at least he did it. No tears this am so that was a good thing too. I think his little brother who is 4 is causing him alot of anxiety he is very hyper and doesnt listen well in the ams he is also very loud. I think his behavior is making all of us a little jumpy latly, so I could see that as a big source of anxiety at home, we will definitly have to work on it. Its so hard to work on things when the meds are not right, older ds is really silly which gets younger one really really silly which is harder to control they both get each other worked up with yelling and running with the dog and things. I am really looking forward to the last day of school this week so we dont have to be on such a schedule in the am. And for last night its like that any time we go someplace as a family together, but I wont give up if hes not put in these situations over and over he will not learn to handle himself correctly. I know what you mean about the bullying and ignorants its not a huge problem yet, but i see it starting to become a potential problem. Hopefully this summer we will get meds under control enough so we can start to work on things socially more. I hope Im not rambleing on too much in just this one thread lol It just helps so much to talk to others about it thank you so much :)Is he seeing a psychopharmacologist? They are psychiatrists who specialize w/meds. We see one.
You sound like you know what you are doing. If we can be of any help, please ask.
You are amongst friends who care! 
Hi, my son is 9, dx with adhd by a childrens hospital with neuro pysch. We began seeing a psychiatrist who put him on tenx after 2 months things went really great for one month, and suddenly all the old symptoms came back full speed ahead. The doctor said lets keep an eye on this and it could possibily be aspergers or pdd which we will medicate when the adhd is under control. This sounds like so much meds already for the poor kid and hes so small! Im scared im going to do damamge that cant be fixed. Ds is not doing well with the raised meds (tenex) he blinks his eyes so much, and says they are itchy its not allergies. He flaps his hands around when hes nervous excitied or real happy. Now he comes to tears quickly and doesnt want to particape in alot of things. Im not sure if all this is because hes just on the meds for a week and a half, or if things are getting worse on their own. If its hurting him I want to stop it right away, but i know the meds can take a few weeks to start working properly. Its so hard to just trust the doctors and possibley add more meds to everything ontop of all the this. I am a nervous wreck I know im the only one who can protect my son and speak out for him, but with all this going on my head is spinning and i am so worried. I hope and pray im doing the right thing by keeping him on meds for now, we are going to see the behavior therapist today( we saw him before but things were going so well at that point we didnt need to go back) with a bunch of new problems I hope we get somewhere.I have no expereince with meds, but have read a lot of others replies. Some say too much Tenex caused problems and when they decreased the dose things got better. Had you increased the dose and then starting seeing problems? Also, I'm confused. Has your son been on Tenex 2 months or 1.5 weeks? Is he on any other meds?Hi yes we have increased the tenex about a week and a half ago, and hes been on the meds about 3 months total. There are no other meds at this time although doctor says we may start treating some sypmtoms of asbergers. Whats confusing to me is after a month and a half or so on the tenex the first time he started doing so well that lasted about a month and then without changing anything it was overnight he was back to his old impulsive self. Then the doctor increased the dose a little and wow symptoms are alot worse and I am stressed out just trying to make it through the day with his behavior/ side effects.