Vent all you need to, keep posting. You're honest with yourself and you've been honest with him about your feelings. There's not much more you can do if you decide to stay with him.
That's the insanity of alcoholism. No matter how bad an alcoholic gets, there's nobody that can convince them they have a problem except themselves. I can see so many similarities between the way your AH acts and the way I used to act. There is help for him, but all you can really do is pray that he seeks it out. An intervention might be worth trying, but in the end your husband is the only one who can make the decision to help himself.
Scott