Perhaps this has nothing whatsoever to do with drinking. It could be trouble at work, the death of a friend that he doesn't feel comfortable discussing, or maybe his favorite team is doing badly
I'm not trying to make light of things, but you should raise the issue with your husband in a calm, loving and relaxed manner. I hope it's nothing serious or a relapse, but I found a lot of the responses to be focussed solely on his attendance of the meetings etc. It might be something "normal"