Ditto on all the above. He's sick. Unfortunately abusive. If you have a place to stay go there with the kids. It's the right thing to do.
This disease sucks. Plain and simple. It turns good people into monsters. Perhaps he can quit again, perhaps not. You're sanity and your kids emotional health is what is important here. Get away asap. My thoughts and prayers are with you mlo.
We're here for ya.