In the shower of all places, straightened up from getting shampoo and felt a sharp pain in the top of my back behind my shoulder. My body almost locked with pain and I couldn’t move my neck, back or arm. This was yesterday and although it’s eased I’m still in a lot of pain. Fine if I keep still but agony if I move in a certain way or turn my neck too far. I’m currently using a heat pack on it which seems to help but is this the right thing to do? I’ve done lots of heavy warehouse work in the last couple of weeks and wonder if that’s what has caused strain. I have work tomorrow with no available cover so any fast healing ideas welcome.