I am aware and compassionate of your situation, but a bit confused. It seems you know the situation you are in is not as healthy one, as you stated yourself that it made things worse. Love does not require sacrificing your morals or happiness for someone else. Perhaps you are attached to this man because you feel he loves you, but with assistance, you are capable of loving yourself much greater than he, or anyone else, ever will. Many of us here have been in tough relationships and I promise, once you love truly love yourself, life is a lot more meaningful.
You CAN get away. I've witnessed it first hand. Yes, he may come after you, but like others mentioned, there are people and places that provide a safe shelter in those events. You may move to a different area while in those safe places, but their priority is keeping him away from you and getting you back on your feet. The help does exist, but only if you are open to it.
I think you came to this site because you want help. It is ok to be scared of what that might entail, but know that you are worth it and you can do it. You have a purpose here on this Earth and you deserve love and happiness.
I hope find some comfort in the posts you read. He is not all you have... you have yourself, and now, you have us.