Yes, black mold CAN cause fibromyalgia. A friend of mine was recently diagnosed with fibro, then they found she was exposed to black mold. So, her fibro IS treatable, as are the fibromyalgias caused by viruses and other illnesses. Mine, I was diagnosed with fibromyalgia 15 years ago, has no apparent cause. I've been doing everything else to treat it over the years, though; some more successful than others.
No one knows the cause of fibro ... Sorry!
I highly doubt it. Fibro is a syndrome caused by many conditions and usually brought on by a traumatic event. Anything is possible. God Bless