I have been getting trigger point injections for a while and they have been helpful. But, the last time it hurt worst then most. The injection was in the area of a herniated disc in the C5-C6 area. It has been 2 days and has remained swollen and painful to the touch. In the past, the pain receeded after a day and a half. The arm/shoulder is still stiff and sore if I attempt to lift it. I'm sure it is temporary, but it is worrisome. Is this anything to worry about? Has it happened to anyone else before?