A diagnosis of PCS is meaningless. What matters is how your body and brain react to specific situations/activities.

Exercise will more likely improve your intelligence health than harm it. The increase in blood flow to the brain is always good unless it causes head aches.

The standard for PCS is you treat the symptoms, NOT the diagnosis. So, regardless of what is causing one's symptoms, one still treats them individually such as head ache relief meds.

I suggest you look into therapy or counseling to help you let go of your hypochondriac thoughts. They are more damaging than the risks you use them to prevent. In other words, the anxiety of a hypochondriac is damaging regardless of whether there are any true risks of injury or illness. Anxiety is a brain toxin.

My best to you