Medications no longer working? | ADHD Information

Hello Everyone,
 
 I'm a 20 year old male who has been taking Medications for ADD for about two years now.  I started with 10 mg of Adderall, and it worked great.  I found it every effective, and I did well in school.  My body started to gain a tolerance to it and I bumped it up to 20 mg a day.  This was pretty effective, and it worked for about a year (although I did take the summer off).  Last winter, I could feel it wearing off, so I bumped it up to 40 mg, which worked for a few months, but when I stopped taking it during spring break I returned to find out it wasn't as effective.  I kept trying it, but found it wasn't working.  So I tried 60, which worked alright, than stagnated, than 80, which also didn't work.
       When it wasn't working, it made me slightly happy, but I could feel my mind still wondering, and found myself procasinating again.
      I tried Straterra, which didn't work, than Ritalin, which just made me really depressed.  Now I'm on Dexedrine 15 mg and day twice daily.   I can feel the procrasination, and other things that I felt when I felt adderall not working.

I don't drink, smoke, or do any drugs, and I do not take any stimulants for recreational uses.

My question is what should I do?  Should I stop taking medications for my add, or what?  I'm really confused and worried.
I also would contact your doctor, there are a lot of med options out there.I'm sorry you are having trouble finding the right med.  Unfortunately, I don't have any advice.  I think you need to consult with a dr.