Most doctors don't have a clue about this. I rested for a long time and also almost isolated now for about a year. Sometimes I think this made things worse. For e.g. when I stayed in relative's house I was able tolerate people to some extent and sit down and chat. Now I can't even do that or talk over the phone without getting dizzy. My symptoms are there the minute I woke up and till I go to bed.

For me resting made my body more painful and all kinds of aches and pains started cropping up. If I have to back up when the symptoms begins then I have to be in a coma since my symptoms never takes a break. Only the intensity changes even if I do nothing I can feel horrible. This thing is so confusing since for severe TBIs they start rehab as soon as possible - sometimes in few weeks. PCS is also a mild TBI but rest is recommended.

I doubt there is a simple answer. Each brain is different and every effort is trial and error.