Hi Ella,
Yes, I would definitely call peer aggression a behavioral regulation problem, but that is just my opinion. For Matt he would get along great with peers for a good chunk of time, and then his internal resources would wear thin and he would snap. Mood stabilizers helped with that somewhat - although not completely. Depakote might help Seb, and I would certainly leave it open as an option - but If the Daytrana patch helps, than I would use it for sure!!!! No questions asked!!! The emotional well being of his future depends on his success now - every peer interaction that fails will be stored away and slowly erode at his self confidence - every peer interaction that is successful will be used as building blocks towards molding his sense of his self and worth.
As far as him eating - my son never, ever ate lunch for years. No matter what - and he was not on stimulants - it was just his metabolism. He would eat a good breakfast - and sometimes that was it....he was just not a hungry child after his day got going. I never really fought it....although it bothered me a lot, and he grew up just fine. He is 6'3 now - and healthy as a horse.
good luck - and I am glad camp went well today!