Is/was he on any medications for any of these diagnosis's? In order to help, we difinitely need more info. The more detailed, the better. What kinds of things are they addressing in the IEP? What does "more and more out of control" mean in your situation? What kind of doctor diagnosed him and when? What is the family make-up? Is there any diagnosed or suspected but undiagnosed mental health issues on either side of his family tree? An example is that my mother is, I swear, Obsessive-Compulsive but would swear on a stack of Bible's that she has NO problems. The more information you give us, the better equipped many of us will be able to help.
Welcome to the family. Chances are, someone (or more likely most) here have been there, done that and can offer great advice. We prefer not to just take a stab in the dark. We know how unhelpful that would be.