Has anybody made the experience that vitamin D increases her/his fatigue? I was taking vitamin D for some month now and I now think it worsened my fatigue and PEM. I dropped it a couple of days ago and start to feel better. (The only problem is, I am taking equilibrant/oxymatrine since June now I don't know if vitD made me worse or oxy is making me better...) And some years ago, I spend one day at the beach, just lying in roofed wicker beach chair, and I was extremely fatigued afterwards. So I would not be surprised if I got a vitD boost by being in the sun and the vitD made me fatigued. And I wonder if GcMAF (vitD binding protein) works because it lowers vitD.