I have given up drinking. I don't use AA so I'm not sure how you are meant to feel if you are using that program.
But the old obsessive black thoughts came back when I stopped drinking. I have OCD anyway, so obsessive thoughts were quite hard to control. Worrying about the future, mulling on the past etc. I used the CBT / REBT techniques of Smart Recovery and can fully control them now.
The Smart "tools" are free on their site. You do not even have to join to access the toolbox.
But if you do sign up, there are a lot of essays and articles on how to take control of your thoughts and emotions, so they don't run away with you.
Hope you find peace soon