I am not an expert so I may be wrong but PN is damage to the nerves and is usally from a condition,injury,illness etc. Sometimes like for myself the why is unknown. You can have numbness,pain,burning,tingles etc. For fibromyalgia it is wide spread joint and muscle pain. I think the cause can be unknown.Now for me though I don't have fibro I do have a lot of joint and muscle pain and no one can touch me but I think that is from my PN and RSD.
Have you seen a neurologist? How did they dx you with PN? Do they know why you have PN? Have you had bloodwork