Your question is difficult to answer. The vast majority of those who suffer a concussion heal spontaneously. Of those who have prolonged symptoms that last long enough to be termed PCS, the long term prognosis is mixed.

The important thing is to not try to compare. It is not helpful. Every case of PCS is different.

You state this is you last concussion. How many concussions have you had ? How many head bumps have you had that you do not consider concussions ?

Please be careful with the chiro. Some are too aggressive with both treatment force and frequency. The upper neck is very critical.