Doing a water only fast is really effective with a lot of troubles. Many people are afraid or think they don't have the willpower to do so, though. Look up essiac tea, doing a worming/parasite cleanse like the black walnut, clove and wormwood tincture, make sure there's elimination at least once a day, make sure you're drinking the cleanest water possible. Try to minimize all the toxins exposed to daily, like deodorant with aluminum, don't cook on or with anything besides cast iron, glass, or stainless steel, no prepackaged or fast food, reduce sugars and any chemicals like pharma or illicit substances. Look into bovine offal supplements a lot of people report improvement with fibromyalgia while taking them.