Thanks Mark, that makes sense.

My neurologist also mentioned that recovery from setbacks continues regardless of how little stimulus the setbacks may have needed. In my case I am worried because my most recent setback came simply from watching tv n loud sounds for a long time back in November and I have not felt my headaches improve from that in the last 85 days. By my neurologist's logic, regardless of how fragile the setback may have been, the brain will continue to replete the damaged cells, albeit at a slower pace after each setback. Does that logic make sense?