Crystal, I can see how that would feel discouraging, but I think you should take heart. The fact that you were going for walks and starting to feel like yourself at four months PCS is encouraging.

Patience is the key (believe me, I know). You pushed out of your comfort zone and had a setback. It happens. Now take a step back, go back to basics, and do your best to stay "sub-threshold" of symptoms so that you can resume healing.

I'm at 6.5 months PCS and have gradually made significant gains, including over the last 2.5 months, for what it's worth. It's just a painstakingly slow process (or can be).