Are you taking vitamin and mineral supplements? For vitamin D to be converted in the body to its active form, magnesium, boron, zinc, and vitamin A are needed. Many people in the US are magnesium deficient. Zinc deficiency is also rather common. Are you taking high potency B vitamins? A deficiency of B vitamins can cause anxiety. Are you anemic? Are you sensitive to perfumes, diesel fumes, and cleaning chemicals? Did your blood vitamin D levels rise to normal ater taking the vitamin D? Exactly what are your symptoms? Fatigue? Anxiety? Is you body temperature usually normal or below normal?