This article claims that in fibromyalgia patients, blood vessels in the extremities have excessive nerve fibres in "arteriole-venole shunts" that influence ((Circulatory - System Overview|blood vessels)) regulation and leads to the typical pain experienced.
[http://fibromyalgiaresources.com/fibromyalgia-mystery-blood-vessels/]
For my understanding, this might include a "new brain-type" proliferation after ((Nervous - Sensory Innervation|sensory)) self-devaluation resolutions and sensitizing , or like there could be a ((Musculoskeletal - Periosteum (Visceral Fascia)|periosteum)) reaction involved.

What do you think?