Get yourself and your kids out of that situation.
I know it looks insurmountable, but it is quite POSSIBLE. There are organizations that will help you. Help you with housing, help you with a job, job training, and even transportation.
The longer you stay, the more beaten down you will become. Remember, your kids are watching and learning. You are not trapped, it may feel like it, but there is help. All you need to do is seek them out.