Yeah, I get hung up in the "in sickness and in health" part. But...realistically...if the shoe were on the other foot (and I was the alcoholic) how long would he put up with me? Doubtful it would be for long, especially if he had kids to protect.
The hardest part of all of this is giving up the role of "wife" in my definition of it. And then I remind myself that he has yet to be a "husband" so why bother? Keep it in perspective.