to the pain lecture I attended last spring...

Fibro is thought to be central pain disorder, where the amplitude of nervous signals is higher than normal. Like a radio volume turned up very high.
That it has shown to be 8 times more frequent in first degree relatives, and is
now thought to be hereditary. Fibro patients interpret neuronal signals that are typically normal to most people, as painful.

That any TRIGGER, illness or syndrome of pain, will set it into motion.
Arthritis, car accident, huge trauma, intestinal infection (for IBS), etc
is typically needed. So I think PN qualifies as a trigger. But that does not mean PN causes fibro... in everyone. You have to be genetically wired to respond that way.