Bless you OP!
It took me years to find the courage and I only managed because of MN. I never really posted about my own situation because it was incredibly complicated (made so deliberately by my now Ex) but I took heart from the amazing advice and support given to those who did post.
You are not worthless. Never think that. I truly believe in affirmations. Whenever I get a bit down I tell myself something really good, and it works, especially when it is true :) Never ever say 'I am..' and follow it with a negative!
It is not so daunting once you have support. I turned to everyone I could, my GP, Womens Aid, the CAB, I tried 3 solicitors before I got one who I knew understood where I was coming from. My Ex froze our money and my self esteem was so low I could not even apply for a job. I got to £14,000 in debt and in utter desperation I went to the CAB and lucky for me a solicitor was there doing free consultations. When she heard my situation she just smiled at me and said 'let's scare him shitless!' :) I saw the light at the end of my tunnel then :)
Do not hesitate to call the Police. My Ex was not physically violent but he would stop me leaving the house and he would shout at me a lot. Luckily he got overheard by a police woman but I did record a lot of his tirades so that I could prove to the police that I was not lying because he was so so good at appearing reasonable!
You can do this, you can leave. It is scary but if I did it, anyone can :)
And even, would you believe, my Ex comes here and sees our kids (they are young adults) and he does odd jobs for me. I know they say dont let your Ex in your house but I am no longer scared of him, he has no power to hurt me and we get along quite well, all in all. And I am loving waking up in the morning knowing that I can actually do whatever the hell I want, whenever I want without any unwanted input from him.