My problem was that the tension in the small muscles of the neck and head, the massiter muscles, suboccipitals, etc., became so tight that, not only did I have
pain in my upper back and neck, but I also had these pounding headaches. The first 6 or 7 discs of my vertabre were out of alignment as well.
Over several months Iwe did traction, (which helped aLOT), and my PT would massage the small muscles that were causing such major pain.