I know it's hard, but anger will only make it worse. A lot of us here made the stupid choice to go with the alcohol when someone gave us the "It's either me or drinking" ultimatum. If you really love him try to get him help and be supportive. If you get angry and leave him it may trigger him to get even worse...that's what my experience was like.
All the yelling and threatening in the world won't solve it or bring peace to your relationship. Marriages take work. This is your time to shine.
It's good you came here. There are a lot of folks that can help guide you.