I just came back from a 2500 mile trip from Southern California to Oregon and had to deal with the same symtoms. My sister who is a certified therapist said I spine problem in my neck, and suggested either I go back to see my doctor and a Chiropractor. The muscles are affected when the bone is irratated, and in our family we have a degenerate problem of failing bone & joints. I've tried different helmets, and windshields, and almost got a riser but basically if its starting to hurt, stop, stretch and take an advil.