I used to ask myself the same question: "how did it get this bad?!?!" It seems to be par for the course with addiction.... it becomes a vicious cycle that just slowly keeps getting worse.
I drank to relieve my anxiety/depression and eventually became a daily drinker, too. It wasn't until I'd gotten sober that I realized most of my anxiety and depression were caused by the alcohol. I got to the point where I couldn't take it anymore and that's when I found this forum.
Getting sober was the best thing I ever did. You can do this. Keep reading and posting - you're not alone......we know what it's like.