I feel 100% certain that this:
https://en.wikipedia.org/wiki/Fibromyalgia
Is a dietary condition.
What you need to do is experiment with eliminating entire types of food until you figure out
what is disrupting you body.
It is not the same for everyone, and it changes from person to person from year to year,
which is why this condition will be diagnosed as Fibromyalgia or any other number
of western terms depending on who you talk to.
The first experiment you should try is to cut out all carbohydrates for at least 1 month.
This includes all fruit, bread, sugar, yeasts, starches, fungus.
Actually it would be easier to tell you what you can eat:
Eat only meat, fish, salt and green vegetables.
For four months of every year.
Give it a try, or perhaps speak to a dietician
if you need more convincing.
I consider it to exist because in ancient times,
we would typically only eat meat, salt, fish and green vegetable
during the winter months as nothing else was available.
So a whole variety of parasites which live on the carbs would die off during winter.
Only in comparatively recent history have we had access to any food any time.
Because the parasites which live on carbs vary so much, this is why the
symptoms can vary so much. Almost any ailment that persists for no obvious reason
(even cancer and obesity) can be attributed to what I am struggling to find a name for.
Perhaps
'Fridge diet disorder'?