you might want to check out
https://inclinedbedtherapy.com/testimonials/fibromyalgia

There might also be a connection to lyme disease ("lyme disease, anatomy of a cover-up"), heavy metal poisoning (usually from amalgame fillings), focal infections (root-filled teeth), natural radiation fields at the sleeping place (water veins), atlas misalignment (see http://www.atlantotec.com) and sometimes parasites or microbial infestation.