My son is ADHD with ODD. He had been on Adderal but it had no effect on him one way or the other. He is now on Ritalin LA and 2 doses of regular Ritalin, nothing seems to be helping. And he has lost 5 pounds. Not great when he only weighed 62 to begin with. I am considering taking him to behavioral therapy to see if he can learn some self-control techniques that could help in addition to the meds. At his next appointment I am asking for his meds to be changes since the regimen he is on now is having no positive affect and a negative affect of weight loss.
I hope you can find something to help. I know my son has said before that he tries to hold things in while at school so his friends don't think he is weird.