How do you know when my child needs his bi-polar checked again??

My son went into the local psychiatric hospital when he was in 5th grade for what they called a bi-polar break through.  He was being treated for symptoms of depression and ADHD at the time he went in.  They took him down off all his meds and then determined that he was bi-polar with ADHD.  They put him on Abilify and seraquel and concerta. 

He has just finished the 8th grade barely and has really become easily agitated again.  He has gained enough weight due to the effects of the meds that he is now overweight and gets teased about that.  he struggles contantly with school and organizational skills but when I tried to get the school to set up an IEP for him to get help with a couple of subjects and organization, they said he didn't show a need. 

I just wondered whether we should take him back to be re-evaluated.  Is there something other than bi-polar that could be causing symptoms of irritability, mood swings, and lack of concentration and organizational skills.  Is the medicine he takes for bi-polar that makes him gain weight more important than the self-esteem he lost when he became fat.  I have seen how cruel the kids can be to him and others that are bigger and his self-confidence was medium to fair before the weight gain.  I just don't know what to do for him and it is very frustrating to see him struggle everyday with the weight and school.  Do you have any suggestions?  Thanks.

Sunni Chaplin