I got a flue jab a few years at work. As she put jab in through bone it was really tough and the nurse said oooh you've got strong muscles? (This is to the least sporty person in the world..) I stupidly didnt make a fuss and put up with it for ages until months went past.
So I went to the NHS and explained that I had a bad sholder scince the jab and what it could be and they pretended it wasnt possible and that I must have injured it... Which I knew was not true?
Why they insist on lying about it I don't know. I now realised I should have kicked a fuss. Two years later sholders okish... just aches in damp weather!! Still very annoying!