the vaccine itself is not likely the issue but rather the injection. hidden under our opaque skin and subcutaneous tissue are nerves. the nurse may have given you the shot in a wrong location or used a needle a bit too long or it may have been a fluke -- hitting a nerve that shouldn't be there. you will need to see your medical provider and perhaps see a neurologist. many times these post-injection neuropathies will self-resolve but you need to be examined. your inability to lift your arm is not something that can be ignored.
my flu shot last week was terribly painful and now i can barely lift my arm. what is happening?