You might look into neurofeedback. It has helped some people regain brain function. When it works, it can work well, and it's non-invasive so you don't have to

You might look into neurofeedback. It has helped some people regain brain function. When it works, it can work well, and it's non-invasive so you don't have to worry about side effects. The book Symphony in the Brain is probably the best intro. There's also a chapter in the book The Body Keeps the Score.