Yes alcohol can cause brain damage including memory loss. You can probably speed up the recovery process by playing memory games. For example get 2 decks of playing cards with the same color back. Take out a pair of matching cards (2 kings of diamonds, 2 queens of diamonds, 2 jacks...etc.) Get about 36 pairs, shuffle them, lay them face down on a table 6 rows by 6 columns. Lift each card up one at a time and remember where it was, then place it back face down in the same spot. Lift another card and remember where it was, place back in the same spot face down, keep doing that until you see a card you've seen before, then find it's matching pair. When you get a pair set them aside and give yourself a point. You can time yourself if you want to track your progress over the next few days, weeks, months. Just be aware there is also a bit of luck involved in how fast you can solve a "board" because you can be lucky and find a matching pair immediately sometimes.
You can make larger "boards" as well 7 x 7, 8 x 8, whatever size you want/have space for.
There are probably some brain exercise games you can find for the PCs/Smartphones/Tablets as well. Have fun with it and don't get frustrated if it's hard at first, you're making progress and that journey is half the fun in and of itself!