The main reason was for my health. After I had my gallbaldder removed, I figured some of my digestive problems would stop. They didn't, and in fact got worse. I am pleased to say that, after a month and a half of not drinking, they are now fine.
The other reason was the sheer stupidity of continuing to do something that I strongly suspected was responsible for the digestive problems both before and after the gallbladder surgery, as well as the futility of worrying about whether or not my suspicions were correct. lol