Most diseases have a psychological component, but patients are seldom referred to a psychiatrist for treating their heart ache when they get an infarction.
I just mentioned these findings (and others about autoimmunity against the satellite cells in dorsal root ganglia) to my mum, a doctor specialized in physical therapy and rehab. She went into retirement this year and many patients with ME/CFS.
Her reaction: "So fibromyalgia is real now. I have a hard time believing it… I spent my career fighting it."