These things tend to creep up on us Anon. It doesn't happen suddenly and is usually the result of years of drinking.
For me the key to quitting was getting support. SR really helped with that. I tried for years to quit before I came here but it didn't work, I thought it was impossible. But with the support and accountability SR provided me plus some info on recovery methods (AVRT, AA, SMART recovery) I have managed to stay sober for 18 months so far. You can do this, you just need to click on whatever works for you. I found posting in one of the class of threads helped keep me accountable too
Glad you're here x