Interesting, Herculana. I am definitely one who struggles with decisions, because I'm afraid of doing the wrong thing. Then, once made, I wrestle with woulda, coulda, shouldas. It's a viscious cycle of anxiety, rumination and worry.
What's been helpful -- and infinitely easier -- about the no drinking thing, as Anvil said above, is that I've just taken it off the table as an option. The decision is made. I'm not going to drink, no matter what, why or where. It's never going to be a good idea!