[the violent jarring of my head ]
from the chiro?? There is no need for any rough or violent adjustments..

Your muscles might be locked up and in spasm if chiro needs to be very firm with adjusting.. but rough or violent..nooo..

If that is how they usually do their adjusting, find a better and higher skilled provider....
And if muscles are extremely tight, that needs to be resolved before adjustments can last long term.

The chiro I went to treated muscles, posture as well as adjusting..
He used ultrasound, manual trigger point work, low level laser, massage..
The muscles need to be cared for as well as the bones & joints..they all work together...