You need to stop telling yourself that your brain is much more sensitive now to any knocks. Your psychological self is more sensitive but your physiological brain is not. It might be a "slight" bit more sensitive, especially during the short time after your concussion.

Your concussion required a force of 60 to 80 Gs. A sensitive brain might be sensitive to 40 to 60 Gs. A 3 G bump is not noticed by the brain. It may trigger a startle or other anxiety response that can grow into a full blown anxiety event.

As I have said many times before. Your mind will memorize the symptoms from your concussion and replay them when you let your mind trigger that replay.

They are often called Flashbacks. They are a part of PTSD and other trauma experiences.

We need to recognize these flashbacks and find a way to minimize the way they can self-exagerate. If we let them get out of control, they will take over our lives.