Ben,

If all the activities you list here can cause concussions the whole worlds population meaning every person is concussed, don’t forget being born with a concussion due to our heads being forced through a small cervix.

Relax a bit and force yourself to stop reading about concussions. I would take a guess that you are searching to find simpler excuses to what you know is really runaway anxiety.

I would say all of us here have experienced anxiety from our injuries, it is beatable but you have to face it head on and not allow the fear of your foe to overcome you.

Bud