Interesting you mention that. Although the nuero doc says I am textbook PCS, my chiropractor says in addition to that I do have some whiplash and that the xrays show my atlas thing is way off, so I have two things contributing to these headaches which have been constant and debilitating for almost 2 months. Chiro says this could be from this injury or older injuries. My neuro wouldnt even look at the xray (only mri) and wrote off the chiro. The chiro did some neck adjustments which did not help with the headcahes so I discontinued. I do think both are contributing to the pain.