@plantlife
How did you get on today? Gotten out any more? Is he due back soon? Thinking of you, love. 
I know you won't like to hear it, but I think you are making excuses for yourself to not get away. The organisations may not want to help; they may not have space; they may be restricted by area, etc.
You need to find out for certain, rather than worrying before you know and letting that fear stop you even asking.
You should understand that the abuse you've suffered are massive contributors to those fears. He's treated you so badly he's convinced you that there is nothing in this world better than him, nobody else who can "take care of you" besides him, that tolerating his abuse is so much easier than anything else.
It's his thoughts imposed upon you that magnify fear and worry about help.
See if you can talk yourself through that bit.
See if you can push yourself past his impositions into your thoughts and convince yourself that maybe he's wrong, maybe people can help after all.
See if you can convince yourself that you don't actually know things would be awful elsewhere, you don't actually know there won't be help for you.
See if you can push past his thoughts and find the truth. That's a good first step toward your eventual emotional freedom.
And definitely do NOT worry about him once you've gone. He'll be fine. I assure you. They always are. Always.
He will act out and say anything he can to keep you under his rule, but it's all just an act for that one purpose, nothing more.
By the way, you don't ramble. Your posts are rather well thought out and coherent. Please stop apologising to us!