I understand why you are asking the question. And I also understand why so many are questioning why it matters. Because of course stopping and staying stopped is the main imperative. But I also get why you are curious.
I never thought in the midst of drinking that I was self medicating. But now that I've stopped, I feel pretty sure that's what I was doing. Of course it only makes anxiety and depression worse, on top of all the other damage it does to your health and life, so it's a ridiculous and self-defeating "medication".
I stopped drinking and started using antidepressants. It was amazing how the desire to drink diminished. Of course it is still a battle, and no magic pill, unfortunately, but in the beginning I noticed the same effect you are.
The main thing, of course, once you've realized this, is to not go back to thinking that alcohol is OK in any circumstances. You are now, finally, taking care of yourself, and life is opening up. It's a beautiful thing.
Stay the course!!