My son did worse on stimulants, there are some non-stimulant adhd meds that are also antidepressants. I would make sure ask your son if you can tell the Dr. that he has felt suicidal. Asking helps him feel he's in more control. The only thing that has worked for my son is lamictal but it hasn't stopped or slowed down his picking. I would really try a mood stabilizer before an AP.