The only exercises you should be doing is what the physiotherapist
suggests for your pulled trap muscle, after your doctor was given the OK,
since you had a serious concussion.
The OS is another issue altogether. Is it recurring or chronic?
You may need to see a sports medicine specialist for that, after you have fully recovered from your concussion.
I sympathize with you and understand your situation very well, since I had suffered a few injuries myself, in my younger days as a soccer player (high school and college level). It was very frustrating, but that's unfortunately common in the world of sports.
Best wishes,
Niko
Until the effects from the concussion are better you should not be doing any kind of exercise. I would follow up with your Dr on your concussion sinc eit has been a month.