Whooping. I had the same thing and after many visits to specialists found I have mayofacial dysfunction. Have you had any injuries to your neck. It took over 10 years for it to show up for me. Anyway, you can get cortisone shots in your neck which will help with the pain. I have had a headache 24/7 for over 20 years now. It does vary in degrees after having the shots. Hope this helps you and good luck.