You poor thing had to say my heart goes out to you!
I had problem with my ds when he was 4-5 it was different to what you were saying about your ds mine decided that he hated me and mums were lower class people talked horrible and would get angry towards me punch and kick walls ect. we didnt experience the type of anger you are talking about but i know the pain of thinking your child has something wrong he seems evil thats how i felt at the time anyway.
my advice would be to get some outside help
Does he attend kinda or day care cause thats a great place to start asking questions he could be getting it from somewhere out side the home?
i went to my maternal child health nurse and they sent a lady out to talk to me she came back and observed him talked through different stratagies with me really helped to talk to someone and see that it wasnt my fault.
In my case it was as i suspected he was angry over the birth of ds2 he was born sick and for 12 months needed my attention i tried to be fair with them but when one child sick they take up a bit more time. we worked with him through it and he is the most beautiful boy and very loving and caring sometimes they see things differently to us and he could be angry about something that doesnt make sense to you.