Halfnelson,

It sounds like you have some kind of an undiagnosed and unresolved injury other than your brain. Your brain should at least be stable after 18 months. I still have head aches 18 months after my most recent head impact but they do not stop me from activity very often.

What symptoms are still chronic ?

Do you have tenderness at the part of your skull behind your ears ?

btw, The work out to the level of a return of symptoms is similar to the Buffalo protocol except the Buffalo Protocol suggests reducing the exercise level to 10% below the level that causes a return of symptoms.

Cognitive rest does not mean no cognitive effort. It means moderated cognitive effort.