Haven't been able to stand up for more than about 30 seconds in two and a half years. I went off all meds for 6 months and I got much worse. The only thing that helps me is meds. That said, I went and saw many doctors and got a diagnosis that my primary problem was a migraine.
PCS is a cluster of a hundred different conditions.
Proper treatment depends on what your primary problem is. And of course there are no guarantees. It's going to be wide variation in responses and different treatment protocols.