I am not going to diagnose your child, most definitely I would take him to a child psychiatrist. What stands out most to me in your post is the 'negative comments' the voices say. In my support group one young woman described to us her voices and they are mean, they tell her she's ugly, she didn't wash the dishes right, no one likes her, stuff like that. Its a running negative commentary. I don't know that this is what your son is hearing. None of us know what exactly your son is going through but something is amiss and you do need professional help. But for sure, reassure him he is loved and that you are with him no matter what.