That is how I feel about the pain I get - no rhyme, no reason. One day in my upper back, next day hips and shoulders and then the right side of my skull! Go figure. I also thought that work was aggrevating me but after 2 weeks off I am still getting the severe pain in my legs as if it is in my bones. Oh well, go and do some more stretches and take another pain killer.
"It would be a great thing to understand Pain in all its meanings." Peter Mere Latham ( 1789 – 1875) an English physician.