Are people in unhappy marriages any happier after they divorce?

I am very unhappy and I have been for over 2 years. We have no children (im infertile) and I have a great job so I can support myself financially. I have really no NEED to stay. Its more that I am scared of the unknown and letting people down (I am a perfectionist). I dont' want to admit that I made a mistake and hurt other people involved. I am worried that if I go through with this that I won't be any happier because then I will be alone. But my husband is a control freak and a liar and has physically abused me in the past so the stress from his behavior I think is causing some of my health problems. Lets just say I have alot of built up resentment towards him so I don't feel love for him just hate. Just wanted to get some advice from people that have been through this.