it took me awhile also to put together that alcohol was behind our problems. in my case, mine was quite talented at minimizing, hiding and well, lying about it.
i agree with the advice above. it doesn't matter if he needs more notice. it is an issue NOW for you. you've communicated that.
who made him the referee for time restrainst on how long you have to suffer his drinking?
i think it's a great idea to get clear of him for a few weeks and clear your head. why not consider going no contact during this period of time so that he can't confuse you with his blameshifting.
naive