I got a flu shot last november and have had the same arm/shoulder pain mentioned by others. It's been several months now and I can't sleep on that side/arm and it hurts to try and lift it above my head. I couldn't figure out what i did to my arm untl i remembered about the flu shot. i hope the pain eventually goes away. I may say something to my dr. next time i visit him. questioning on whether to get another flu shot after this fiasco.