In my opinion, you have got to get out of there. As you've seen, your mom has not changed a bit, and she thinks nothing of emotionally and verbally abusing your little kids and is so careless they could be physically hurt or worse.

I don't know where you are, but there has to be some kind of help for women in your position. Please find it. I know it's hard and you just went through a lot of hard stuff to get out of your bad relationship. Also, even if you are only separating from your husband for now, if you are in the US you should be able to go to court and have it made a legal thing so you can start receiving support to help you get out of there and have to rely less on whether he wants to help pay for his kids or not. That's the first thing I'd do on Monday - contact a lawyer to see what that would take. Many offer one free consultation if you have no money at all.