My son will be 6 next month. He has a extreme anger problem. He has chased his younger sister with a sharp knife he got out of the drawer saying "I'm going to kill you sissy" in a rage. He has broke 2 doors slamming them in fits of rage. We can't even talk to him anymore with out him screaming in our face. We have been to numerous psycitrists in the past but all said it's normal behavior for that age. He has no impulse control. I can't even take him into a store or public place anymore. He has tried to steal toys and candy because I couldn't get them for him at the time. He spits and urinates himself everytime you punish him. I am afraid that he will kill us or someone else in the future but nobody wants to listen. He's great at school but at home or with other family members he's out of control. He has almost bashed his head through the wall when he was put in time-out. When we took stuff away from him as punishment he goes into a complete rage and I almost called to police out to the house. He turned over chairs and ripped picures off the wall. He don't sleep. We are lucky if he's asleep before 11 and up at 6.30 for school. ANY SUGGESTIONS?