Your situation sounds very frightening. Is she usually clear headed in the am? Perhaps you could tell her the fighting, yelling, ranting is unacceptable and you will no longer tolerate it, as it is hurting you and the children. The next time she drinks and acts belligerent, you must take action. If she is obviously intoxicated and unruly, perhaps you need to call police and have her removed from home.
I am sure that any action prob seems difficult or perhaps impossible. But that is not the case. Do not let fear stop you from following your gut instincts. Its very hard to admit and face the alcoholism. You did that!! Now that you recognize you cannot continue to just go along, you need to figure out best course of action for you and your life. Change is so hard and scary, so many of us here have lived in alcoholic fueled craziness!
Keep posting and keep thinking of the best way to take care of you. None of us know what the future looks like, but sometimes you have to go on faith alone and just take the first step on a new path. Best of luck to you.