This is so important, and don’t trust your vitamin D levels. My levels were “normal” but I needed more. I had every one of the symptoms listed, and they all went away when I started taking a vitamin D3 supplement. I had a headache for a few days after starting, but then the headache went away and so did all of my other symptoms. Other symptoms were: I could barely move due to joint pain, and I had EXCESSIVE thirst every single morning, always. I also constantly got sick for a week at a time every month. My wounds would take months to heal, too, even just a small cut. I am so much better now and it’s all because of a simple little vitamin. ~ A.B.