I also have experienced multiple head (and other body) trauma and have been dealing with long term effects. A couple things I have noticed, which seem to be common:
1) I have developed food allergies;
2) I occasionally have trouble with balance, and until I figured out the triggers (food related and electronics), I kept falling;
3) I NEED Nature-too much external human derived stimuli makes me irritable, have headaches, and become physically ill. The stimuli are particularly noise related and flashing lights (especially blue).
Some items that help me:
-taking baths,
-taking naps in a quiet area,
-spending time with animals.
As for regaining memory/rewriting neural pathways, I read a book years ago that helped me. It was called The Memory Palace. It describes visualizing memories in your brain into related rooms, floors, etc. it really helped me! Before my big accident, I had an eidetic memory. Afterwards, I couldn’t remember a grocery list for five minutes. My memory is much improved now.