Welcome, Sam. I understand the obsessive thinking - I do it and have other issues too, but the best approach is to get the booze out of your system and stay clean. It can be a little rough at first, some of our crazy thinking and anxiety will seem to get worse for a few weeks, but then things settle down and within a period of weeks or months we gain clarity about things and have the presence of mind to actually begin to work on them. Personal traits, insecurities and anxiety that may have caused us to drink in the first place. We can't figure them out until our drug of choice is removed. As Fish said - just don't drink - for any reason. Give it six months and you'll be amazed.
I also highly suggest the December class - you can participate by supporting the others in the class and they in turn will be there for you. You won't have to repeat your story either, because everyone in the small group will get to know you. My class really helped me in the beginning.