I was about to type that you need to talk to a lawyer to discuss your options, and I'm happy to see that you are already on that. An interim order can allow you and the kids to stay in the house and require him to move out. It can also require him to make support payments in the meantime.
The other thing you can do to help yourself is to get to Al-Anon. It will help you clear your head so you can make good decisions for your future.
You need to protect your children, first and foremost. He has already endangered their lives--they could have been killed when he flipped the car over driving drunk with them. Threats, yelling, ultimatums do not work. I am four and a half years sober (in addition to having been in two marriages to alcoholics), and one thing I have learned is that alcoholics quit drinking when they want sobriety badly enough to do the hard work involved in recovering.
Hope you will stick around here, too--this is another great source of support.