Originally Posted by Mark in Idaho

I have not been able to shake my head without causing symptoms for decades. You may need to learn to not move your head too quickly. The tender spot may be due to injured nerves at the site of the impact. I posted a thread on Post Traumatic Headaches that describes this type. There are 2 PTH threads. In the other one, Eowyn lists the link to the brainline article, too. It is worth checking out.