Your brain has certainly taken a lot of damage over the years but I would want to say some positive things.

First, the brains ability to heal itself is amazing. Secondly, aerobic training in general and specifically running is a huge brain booster. Your brain is basically showered with new brain cells when you run. It has a tremendous effect on IQ and other cognitive skills as well.

If you complement the running with eating healthy and listening to Mozart, playing some chess or similar and doing something you like, you have a good plan for your healing.

But the hardest part is to get healthy enough so that you can start the running and start to live a normal life again. How to do that, I don't know. But once you are there, you can heal yourself again.