Like Carl, I had a moment of clarity. A few of them really. The last one I acted on immediately without delay, without overthinking or intellectualizing. For me, it was the moment I realized I was like Sisyphus in Camus' essay, living in futility. I was drinking to avoid the real act of living. I think there's a choice to keep on living. We don't have to, we can remove ourselves from this world if we want. Drinking was not much different from just blowing my brains out. So I made the choice to live and to not drink again.
Then I made a phone call to another human being in a cry for help. It wasn't necessary. I was somewhat functional, but for me, it was huge ... because I don't trust easily. So for me to reach out to another human being was my commitment to join the land of the living.