Hi, I have had the same problem following a flu shot injection given too high on my arm in mid-Sept 2009. I am scheduled for arthroscopic surgery in a few weeks having had steroid shots and physical therapy that did not cure the problem. Through my research, I think it is the way the vaccine was given (too high and into my bursa & rotator cuff) and also the actual components of the vaccine are causing problems. I am in the process of seeking legal help with my situation.