I have a son who is four years old and suffers from PTSD, ADHD, ODD, and severe anxiety. We have a therspist who comes in 3 times a week. He has been taking 40-50 mg of melatonin at night to sleep and that has quit working. I'm afraid to give him more than that. Also, I have been rreading about other medications. Would Vistiril help to relieve some of his behavior problems. Are there other medications that would work better?