You can speed up recovery of your mental abilities by doing intellectually stimulating activities. Pick up a difficult game like Chess or Go. Read difficult books. Play video games even. Whatever stimulates those neurons.
Same goes for physical health. Use your body or lose it.
Don't just wait around wondering how long it's gonna take for your head to feel better. I promise it won't even be a year if you work at it. It can be the rest of your life if you just vegetate, with or without the alcohol.