I reached to right for something in my car, and got a sudden terrible pain/stitch/cramping on the upper right side, and I could feel it pull almost back to my spine. It took over an hour to get it calmed down (heat, rest). This happened a couple weeks ago, and I all did was reach my right arm up over my head. It took two days of Flexerol to make it go away. Is this just a muscle pull, or could it be a bulging disc?