I'm so sorry to hear this. My 16 year old grandson has Tourettes syndrom, which includes OCD, ADDHD, and lack of impulse control. He too has outbursts of yelling, threatening to kill himself or hurt others, which are totally opposite his behavior/attitude when he is feeling "normal" on his medications. He spent a week in the children's ward of the hospital last August because he had a butcher knife and was threatening to kill himself.

They changed his medications and he's doing better since then. Have you had your grandson checked for Attention Deficit/hyperactivity? It sounds like he needs to talk with a psychologist and psychiatrist to see if he needs further evaluation & help. Good luck, Gail B