I don't know if this is relevant but have many of you found you are clumsier since your accidents?
I was fairly graceful before but now I trip over, walk into things, bump my head on the cupboard, drop things and knock things over.
I'm not aware of this being a common symptom of PCS, but I'm still learning about it.

Having read posts on here and general info about multiple head injuries, I'm now terrified of having another bump to the head or minor car accident

Clutziness is a common symptom of PCS. Often, we try to move as if we have the same skills as before and in doing so, out do our ability to track our surroundings. We may not notice that trip item on the floor that prior to our PCS, we would have stepped over without even noticing it. Now, it is a trip hazard. These movements need to be done with more deliberateness, not the automatic, subconscious way we did them previously.

The basic concept is we have lost this subconscious awareness skill so we need to change how we interact with our environment by being more attentive. It is a tough skill to learn.

It may require others in the household to help out by reducing the hazards.

We had a way of dealing with things our kids left out of place. They got picked up and banished to the attic for a time out. They would wonder where the item was and we would say, Where did you leave it last ?

Wow, that's impressive! You must've been one of the best runners in your state at the time. I only ran 9:39 for the 2 mile in high school, but got better in college and ran a sub 15 minute 5k. I won't be running with the team, still just walking for me. I've got my brain and an injured hamstring to heal before I get back to running. I hope my days of chasing running personal records aren't behind me though, I'd be devastated if this concussion ended my running career.

Just curious, do you advise against running because the bouncing injures the healing brain, neck, or both?