All good suggestions. Magnesium, B1, B12... Still, I think it would be a good idea to consult your doc and perhaps ask for a blood panel? It might be alcohol related, directly or indirectly, or it might be something totally different. But drinking does deplete vital vitamins and minerals. Your GP can be your friend and ally in this, and might also have better ways to safely quit drinking.

But most important: no, you probably (I'm not a doc of course) have not yet damaged your body beyond repair. As soon as we find a way to quit drinking, our bodies have an amazing ability to heal. Your life is far from over, and removing alcohol from the menu can certainly be done.