Yes AN, the fact that you keep coming back and keep trying is really a good sign.
Lots and lots of us have to start over and over.
Try looking at your "trigger variables" and writing them down.
What are you thinking about before you go buy booze? Your ex?
The mistakes you've made? Your future?
Notice that and then respond differently when you think about those things as a conscious decision.
Take your pups for a walk. Go to the library and get a book or DVD. Go to an art gallery or museum.
Take a walk by the sea or sit down in a coffee shop to be around people.
You are trying to create a new habit to replace the old one.
I also agree about not posting on FB, and in really trying to connect and give AA a chance at least by talking to people, working the steps, and getting a sponsor.
Also you noted that you don't post on here before a slip. That should be the first thing you do at the moment. I've seen lots of people do this--the "help posts"-- and it seems to work more often then not.
You can do this AN. You want it and if you keep trying different responses to the triggers, I think you will succeed in the end.