Lately, each morning I have had stiffness and soreness in the back of my neck and upperback. Initially, it s mild. However, once I have a bowel movement it FLARES up. It s almost as if my muscles LOCK into place. This will last approximately 20-30 minutes. In addition, throughout the day these same region is fine until I sit or stand stationary for 5-10 minutes. The pain will return lesser but still annoying. Finally, when I retire to bed, the pain returns and it throbs which rarely happens during the other episodes. This pain last 20-30 minutes. Do you know what this may be and what I can do. THANKS!!!