How can a yeast infection affect fibromyalgia, ME/CFS, or myofascial pain?

It is not the vaginal yeast, but rather the gut and sinus yeast overgrowth that aggravate these conditions. Though not get recognized by many physicians (there is no test to distinguish normal growth from overgrowth), Candida/yeast overgrowth in the gut appears to play a major role in these conditions. It is also a major cause of irritable bowel syndrome and chronic sinusitis. This occurs because the Candida/yeast causes an immune reaction which produces nasal congestion and blockage. This results in a secondary bacterial infection, and the antibiotics for the infection can cause Candida/yeast overgrowth resulting in the sinusitis becoming chronic. In addition, Candida in the gut causes what is called "leaky gut syndrome" (more scientifically known as increased membrane permeability). This results in a marked increase in food allergies, and the Candida puts a major strain on your immune system. I routinely treat people with ME/fibromyalgia/CFS/myofascial pain for Candida/yeast overgrowth.