I am so, so sorry this happened to you.
Sad it sounds like you are still thinking that you can change this, that how you handle this will effect his choices. History would prove you wrong - it just doesn't work that way. This has ended with you enabling him - helping him - and you terrorized and physically abused.
How you handle this could be a step in the right direction for you and your son - for your safety, your peace of mind, and your sanity. You have to stop worrying about the alcoholic - who is worrying about you? Who is taking care of you? No one, not even you. But the alcoholic is being taken care of, he is being worried about. Do you see the insanity of this situation?
Please call the DV hotline hydrogirl referred you to - PLEASE!
Sending prayers your way and hoping that this is it for you before you end up hurt again.