You need to calm down. Easier said than done, obviously! But as Mark says it's key to your recovery. Wallowing in stress, anxiety etc is something most people do when something really bad happens to them, but it's a luxury that we don't have. I haven't made any recovery during periods of stress - only when I have managed to take control of my emotions. If you can't feel happy then try and just feel flat - anything's better than the turmoil of stress and worry whirling round your brain.

I think the ability to master my emotions in this way which I have had to learn during my recovery and to feel relatively optimistic however bad the situation is in reality is something that will help me for the rest of my life, so there's a positive!

Something else that may make you feel better is that I suffered a major relapse (after 3 months) following a jolt, and I did go back to square one. But I am still getting better and am well on the way to recovery - it should still come for you, it just may take a little longer. As you say:-

Focus on this - it's all that matters right now. The vast majority of PCS sufferers get back to feeling normal or almost normal eventually and there's no reason you should be any different.