Osteos are pretty good Syramax, that should help, or at least identify what has happened. I saw one about my back and he had me bending backwards, forwards, to the left, to the right and then he said, does it hurt here? And jabbed his finger exactly where it was most sore - nearly jumped 10’ in the air.
Have you tried those heat wrap things - can get them from the chemist or a big supermarket, they help ease the discomfort.