Have you discussed with Dad about putting the child in counseling?
..Umm but its the Dad that needs counsling... Really, after 6 yrs of happy life suddenly my child needs to see a perfessional over his fathers emotional abuse, do you know how devastating that is to a mother.
'So sorry kid but you have to continue to see dad who treats you like ****, or as my son has siad, "has a Bad Heart", But here, you go see a counsiler about this now and ...try not to turn out like him, or want to kill yourself when your older.
He's young enough now that he can get over this, but one day he wont be.