Yesterday I danced a lot at work, and in the night I suddenly turned onto my stomach and felt a sharp pain in my back for a couple of seconds. It subsided. Now I woke up with diffuse pain across my entire back, especially in the kidney area. It's painful to stand and walk, and lying on my back is even more painful. A year ago there were no hernias or protrusions; there was only osteochondrosis. What can I do to help myself — this is the first time something like this has happened.