adamson, you are the first person I have seen metion specifically a headache at the back of your head... I have had a headache there for at least 3 months.... likely much longer, I was takinga lot of tylenol previously and so I think I numbed much of my pain... now I cut back on the tylenol and I feel a headache at the base of my skull nearly everyday. I try to sleep on my stomache because I figured that laying on my back would put more pressure on my head, but maybe I should flip over and give it a shot.