I think you're always going to get the occasional setback, even when healthy we go through bad patches, I think realising it's temporary and will pass is the key to overcoming it.

The mind can be trained and rewired to not react to stimuli that can trigger anxiety this can actually physically alter the brain. CBT is an example of reconditioning. When Bud continued using the anchor that injured him he was reconditioning his brain to accept the anchor as just an object like any other. For many of us the psychological symptoms of PCS can linger after the physical ones have passed or subsided, in western society we don't give them as much time as we should.