I had the flu shot in Nov 2007. At first it felt more like a Tetnus shot. But the pain never went away!! Today months later I am in physical therapy for a Frozen Shoulder. My Dr doesn't think one thing has to do with the other. However the therapist said this is the 3rd or 4th case he has saw with this years Flu Shot!! Has anyone found anything to show the possibility of a bad batch this year??