I have fibromyalgia. Not as a label stuck to something that can't be understood, but firmly fitting to a disease that isn't yet fully understood. (Yay for me - I have every known symptom at one time or another.)
It took ten years, an enormous amount of pain, two neurologists, three GPs, a psychiatrist and a pain specialist before they were able to nail it down - and now they're able to help.
Unfortunately, there was a tendency to treat it as psychosomatic. Also unfortunately, treating it as psychosomatic promotes behaviours like "pushing through the pain" that are absolutely guaranteed to cause a flare up or major relapse in fibroymalgia.
This kind of story created fear for you. And it should, I'm sorry to say. For the most part, you will suffer alone and without understanding, and it's up to the sufferer to push their story along until they get an answer. I'd wish that process on nobody.