All day today I have had a light pulsing headache high in the back of my head.  It doesn't stop me from dong anything, but it is there ... the pulse is not steady, comes and goes, mostly comes.  Originally I thought it was mostly on the right side of my head (ear to top of my head), but for hours it has been more mid-back of head, maybe just a little to the left.  The pulse is approximately 20 seconds apart ... sometimes less.  Pain between 1 - 10 is only about a 3 or 4, so not so painful.  But, I almost never have a pain ... so it is disturbing that I have this headache that won't go away with either Alleve (took one early in a.m.) or asprin, took a couple in afternoon.  It is now late in evening