Hi ! I had an antibiotic injection(intramuscular) in my left upper arm, after 2 days of injection injection site is numb and I can t feel it, i massaged it couple of times but no use. it is now the 4thday of injection. I also took other injection (same antibiotic) in hip and in right arm, all are fine. no pain or numbness, just left arm is numb, I am worried, what should i do.