Hi!
I also got PCS from a snowboard-crash.
Im gonna write more another time, but what you say about the anxiety-attacks and so on. Believe me when I say that EVERYTHING that the brain deals with gets affected. I also have had stressproblems, axiety, nervous-breakdown etc and YES it has to do with my brain beeing more sensitive and out of balance. BIG mistake to think a concussion is a structural damage. My dad has a stress-related problem after working to much for long periods of time in his life with lots of pressure. We can seriously see the same pattern. He hasnt hit his head yet we are the same way. Fatigue, stress, hard to sleep, koncentration-difficulties etc etc!!