aamfs94,

A car's brakes cannot cause a stopping action of more than 1 G. That has been tested. The tires are the limiting factor.

It takes 60 Gs to cause a mild concussion. 1 G has no risk to the brain.

The whip into the locked seatbelt could strain your neck and cause a headache.

Your anxiety can cause symptoms like a headache.

Unless you car or your head smashes into something, you cannot sustain the Gs required to cause a concussion when a car stops or slows down.

Please disregard Caroline2. She does not know anything about concussions.

Just relax. Avoid the pain meds.