So my doc tells me that I have a vitamin D deficiency that may be contributing to my pain and other symptoms! I have no idea why no doc figured that out before. So, I am about to start taking a prescription level Vitamin D supplement to "replace" my store. Anyone know what causes Vit D deficiency? Do most CFS/FMS people have Vit D and other vitamin deficiencies? She is also checking my B vitamin levels and iron too. Thanks for your thoughts.