Since my concussion, I have noticed a significant intolerance to minor bumps that previously had no effects. Small bumps can cause an immediate relapse of PCS symptoms for me.

For example, today one of my friends hit my head with his sweater (he forcefully threw it on my head). I know it's not a concussion (because even though he smashed it with force, it's only a sweater and couldn't cause much damage because it is soft and shouldn't deliver too much force), but I started feeling really bad about 30 minutes later.

I actually felt fine this morning but this bump made all my symptoms return, and now I feel terrible. Is it because of the anxiety, or because of the bump itself? Again, it was sort of a whiplash hit, but I immediately convinced myself it couldn't be damaging to my brain. Despite my attempts to avoid anxiety, this little bump ruined my day and now I feel a strong headache along with brain fog.

What should I do about such things?
Do you also experience a similar insensitivity to bumps on the head?