Some great answers to this thread so far.
I have some personal experience with this, but with a parent, not a partner.
You clearly love your partner, and you want to 'rescue' him for want of a better word. However, I think you have done exactly the right thing going back to your parent's for the moment.
He might not be an alcoholic in the classic sense of the word, but he clearly has a problem with alcohol, especially binge drinking, and I'm glad to hear you are keeping yourself out of the firing line for a while. Not only will this help you, but I think he needs time alone to really think about what he is on the verge of losing.
If he is able to acknowlege he has a problem relating to alcohol and agression, then the best place to start is his GP, who can refer him to a counsellor.
AA is more of a group therapy, and it's pretty geared towards the alcohol dependance side of things, and I think because of his additional anger issues, it might be better for him to see a counsellor for one-to-one sessions.
I just get the impression that AA would be too intimidating for him and I don't think the stigma attached would help him either.
His damaged relationships with other family members have probably contributed to his anger issues, so that's also something he can discuss with a counsellor in private.
I think you can support him through this, and I don't think he's destined to become a violent wife beater in future, but he has some very serious decisions to make now, which will hopefully mark a positive turning point in your future as a couple.
Best of luck with your situation xx