It's been achy for a while and I just put it down to ageing and losing flexibility. Tonight though it has become agonising. I carried a heavy bag of shopping in earlier and put it all away. Didn't feel too much. Is it possible I injured it then and the pain set in later? I'm lying here totally unable to get comfortable. Can't lift my arm, can't lie on it. If I press my shoulder I feel a deep throbbing pain in the socket. It's honestly throbbing like a toothache whenever I move. What have I done to it? I'm actually crying with the pain. It's clicking sometimes too. Any medical people on here with any ideas or advice please?