When I had a concussion, I was told to stay in a darkroom with no stimuli(no tv, computer) in order for my brain to heal by an ER doctor. With a long-term PCS, this approach does not work. I think keeping your spirit/mood up is very important. Western medicine only looks at the injured part/symptoms, and fails to approach an illness/condition from a holistic perspective. However, our body is very inter-connected and your mood will definitely have an effect on your recovery. Walking boosts your immune system up so I try to get some walking in no matter how dizzy/weird I feel. Obviously, you should not push yourself. As Mark said somewhere, you need to recognize your limit and do things in moderation.