Vitamin D deficiency has been linked to fibromyalgia in some studies, so your vitamin D status might play an important role in how the disease progresses. For individuals who don't get enough of this valuable nutrient, improving vitamin D status through treatment with supplemental vitamin D3 might offer some relief from fibromyalgia symptoms.
Vitamin D3 is one of a few different forms of vitamin D. This fat-soluble vitamin can be obtained via food or created when sunlight sets off a biochemical reaction in the skin. The D3 form of the vitamin is created by animal cells, so food products such as beef liver, fatty fish, egg yolk and cheese are the only dietary sources of this form of vitamin D. Vitamin D2, the other main variant of this vitamin, is produced by plants and mushrooms and can be extracted for use in supplements.
Hence, if your wondering why sunbathing depletes your aches and mood patterns, you can see by increasing your Vitamin D3, you can increase your well-being. If you do not live in a sunny climate, and are unable to sunbathe frequently, supplement with D3. I personally do not take my D3 on the days I am lying in the sun for 20 minutes.