zoloft not working after only 1/2 year??? | ADHD Information

my son is on 100 zoloft and 60 strattera for adhd, severe anxiety, and depression.  he did fine for a while but now his depression is back.  he doesn't want to do anything with family or friends.  he has cried at school 3 times in the last week.  his anxiety and unrealistic fears are back too.  he has nightmares and calls us in at night.  he jumps and screams when someone comes up behind him (even with lights on and we're not "sneaking"). he sits around like a bump on a log!  his straterra went up to 60 in January.  He's been on it for about 9 or 10 weeks but his zoloft just seemed to stop working in the last week or 2.  anyone have suggestions or similar experiences?  could the strattera be causing the zoloft to not work as effectively or not at all?  can it wear off?  I take 200 mg of zoloft everyday along with my adhd meds..
I actually have no such problems.......
I think that Straterra should be reduced from 60 and zoloft should be increased.
All the best
MY SON IS 9 AND WEIGHS 57 LBS WE STARTED AT 12.5 AND RAISED TO 25 AS WELL.my son is only on 25 mg and i think it needs to be raised but pdoc says wait. i also trying to up his vyvanse, pdoc says wait. Maybe it is right to wait but i feel bad for his uncontrollabe anxiety.joshsmom, my daughter briefly took Zoloft and she started at 12.5mg then went to 25mg.can i ask the both of you, how old are your kids? and what mg did they start on when starting zoloft, my son's been having depression issues also.