ANY DIVORCE INVOLVES THE FEARS you are talking about. Booze or not. It will be hard, you will get through. Getting through is not an optional thing, especially since you have children to consider.
As for his lack of emotion, THAT seems to be consistent with what I've seen around my abf. Seems to me that booze is just one more tool they have to DENY ANY FEELINGS, especially hurt or guilt. But, I've seen that it in guys who were not drinking.