I started giving my son Omega 3 last week and began having him sleep with 3lb leg weights on the advice of a friend. Both things seemed to help him calm down, less drumming, fidgeting, made it through church on Sunday without major distractions!!!!! It hasn't been long enough to see if there is a change at school - but I'll keep you posted. At this point it is too early to tell if it is placebo effect or the Omega 3.
Keep us posted if you do it.