You don't need to make all those decisions now. Look to the future after you've got yourself and DCs into a calmer situation, where you can just "be" without constantly watching your words and stepping round a big baby's moods.
You sound scared and depressed. I can empathise with that. Please understand that you feel alone and helpless because of what your husband's done to your self-worth. You're not alone and you're not helpless; merely lacking in confidence. You've been through some dreadful turmoil in recent years, with a significant absence of support from the person you should have been able to turn to. That must have badly shaken your faith in the world.
It will help you start to feel better, I think, if you reach out to one or two people for support in unthreatening ways. You could go to your GP, for example, and talk about how distressed you're feeling. S/he might prescribe you a mild antidepressant, and that might be no bad thing, but crucially you will have verbalised your reality to another person. You can also call Women's Aid, just to talk and ask for supportive advice.
Once you've spoken to one or two people, you may then start to see the value in joining a nearby group - cultural, religious, work, children or hobby related - so as to broaden your circle ever so slightly. If you can manage to get yourself some counselling (not relationship counselling, just for yourself), that will almost certainly help you feel more sure of yourself.
In your posts, you seem to be saying that what's happened to you is your fault. It isn't, that's just what bullies do. They work hard to convince themselves, and you, that their abuse is a natural reaction to your personality. Think about it: if you know a quiet, self-effacing woman who's always ready to help others, what do you think? "Nice woman", huh? Of course you do! Only a mean, selfish bully would think "Aha, weak person, I can get one over on her!" You can be as soft as you like, good people will love you for it.
Bit of an essay, sorry. Hope I've cross-posted with lots of helpful responses :)