One of the tools that helps me the most (especially in the very early days) is to "play the tape through" anytime I'm thinking about drinking. I try to think to the next morning, but also to the next few days, two weeks, a month, etc, to myself being back in that same endless pattern of drinking and hating myself, which I am trying desperately to escape. It's helped me a lot to get through periods of craving and second-guessing my decision to be sober.
Keep posting and reading. You can do this!