Addiction isn't a mystery.. we have conditioned and trained our brains reward pathways that alcohol will make us feel better. It relieves stress (briefly) and helps us have more fun (for awhile).
Eventually all this stops working of course, but the reward pathways have been conditioned. That's why we swear over and over again we won't drink.. then we do. That's why we need support. We have to break the cycle.
The brain will heal and return to normal, but for awhile we can't imagine having fun or relieving stress with out alcohol. Find a group, get some support, and let your brain heal. It will rewire itself, especially as you learn to enjoy life sober again.
Trust me, I drank almost every day, for decades, and now after almost three years, the thought rarely even occurs to me. I literally forget about alcohol for weeks at a time.