In Dr. Julian Whitaker's newsletter, he wrote that Dr. Michael Holick reported that 40% to 60% of all fibromyalgia cases are misdiagnosed and may actually be a Vitamin D deficiency. What the person may have instead is the equivalent of adult rickets, which is a Vitamin D deficiency.
The symptoms of both fibromyalgia and Vitamin D deficiencies are very similar. There's an easy way to find out which it really is. Ask you doctor to order a blood test for 25(OH)D. If your levels are low you might want to talk to your doctor about taking very high doses of Vitamin D in the range of 2,000 to 4,000 IUs of Vitamin D per day. (To reach a toxic level of Vitamin D, you'd have to be taking 50,000 IUs per day.)