Recently, I've discovered an interesting trend with how I progress in parkour. If I'm injured, even in some small way, fear will grip me whenever I'm doing even the simplest things, and more often than not, I'll be unable to complete simple vaults that I've done a hundred times before(See: Turn vaults). This was a big thing for me when I had shin splints, as it was difficult for me to hang on to the things I already knew, much less learn new things or get better at all.
Which brings me to a month ago. After allowing myself to rest for a few weeks, taking it light, my shin splints healed, as did all my cuts and scrapes. Suddenly, I was able to do things that I've never even practiced, like konging over the length of a table, or being able to do a decent pop vault out of nowhere. Unfortunately, I had forgotten how to do a decent underbar, but that's a different story.
Fast forward to the present. Just a week ago, I felt my shin splints coming back after a series of bad landings. Once again, I was frustrated as I was unable to do all these things that I practiced daily, so I decided to give myself a week's resting time again. Lo and behold, after I healed up, I was able to learn quickly again, and I was no longer deathly afraid of everything. This applied with even the smallest of injuries, like a skinned ankle or something similar. The point to this whole story is, does anyone else get anything like this? If so, what is the best way to deal with that sudden fear besides giving yourself time to rest?
TL;DR version: If I get hurt, no matter how small, I get really scared of doing anything for no reason. What's the best way to deal with this?