What should I say or do?

Less than a month ago my SO and I got into a very heated argument about his drinking because of the way it effects him afterwards (very mean and falls into such a deep sleep he always pees somewhere in the house besides the toilet as well as other things) we came to an agreement eventually that he would take a break and tonight he is out drinking. I’m upset to the point where I might lose my shit when he gets home because I know he will be wasted but I’m also feeling like it will be a useless argument I don’t even want to get into for the sake of my own sanity. I don’t like to fight in front of our Lo but I can’t let him take advantage of the situation.

Advice please ?