I injured my lower back (pulled a muscle) 4 years ago and about 2 months after I began to get a very severe throbbing in my head after I would straighten
up and after bending down to pick things up off the floor or to brush my teeth. It also happens when I sneeze, get up out of a chair, laugh very hard, and other various times. The pain starts in the lower back of my head, and radiates up to my temple area. I have had MRI's, X-rays, physical therapy, etc. Nothing helps.