I can relate to a lot of the things you said.
Find a distraction - maybe a class you could take, a hobby to pick up, a fun group of friends to hang with, maybe even a support group like al anon (can be helpful for anyone with relationship issues, even if they're not the child/relative of an alcoholic). Just find something to keep you busy. That's the #1 thing that has NEVER failed me when trying to pull away from someone. I'm the exact same way when it comes to trying to leave but always running back. It's so masochistic in a way!
I think you need some time to be single and really get to know yourself. Sounds so cheesy, but it's true.
Just be patient and find yourself a good distraction, and pretty soon your mind will be off him - I promise!
I don't know you, but I like you. If we were in the same city I'd say we should meet up for a drink tonight. Haha!