I too was married to an alcoholic for about 10 years. its no way to live. It takes some planning and help to get out but you can start over.
Ensure you have a separate bank account that you put money into on a regular basis that he can't touch before you decide to leave.
Keep your head up and work towards leaving him because I guarantee you he is not going to change. Even if he does go for help he is facing a lifetime of recovery and there will be times that he "falls off the wagon".