I'm not sure. I think you need to take a closer look at the situation. How often does he drink? I'm confused on that.
It's just that being drunk once every 1-3 months just doesn't sound like an alcoholic. It sounds like somebody that enjoys drinking a lot once in awhile. I don't mean to make light of your situation, but for those of us that have dealt with a daily drinking spouse, yours seems mild in comparison. Maybe I am missing something here.
Somebody will come along with the right questions.