It's a good thing you are not looking for advice on how to change him, as most of us have the learned the hard way that the only thing we can change is ourselves.
You have every right to be as frustrated as you are, but I have to tell you that trying to be the Drink Police and figuring out what he has imbibed and when will only magnify your frustration. Trust your senses. It doesn't matter how much he's had if his behavior is unacceptable at two or twenty. It doesn't matter where his tolerance is as long as you don't want to be around him. You are allowed to have boundaries, even with your husband. His choices don't have to determine your day.
I can't say anything better than honeypig did. Educate yourself about alcoholism and read around the forum as much as you can stand. Eventually you will find a way to deal with this situation, whatever that means for you. Wishing you strength, courage, and serenity in the new year.