When I was 9 years old I developed a low-grade fever for several (9 - 12) months. During that time I was frequently in the Dr.'s office trying to find a reason. None was found. After that year, I always called myself chronically exhausted. Nothing seems to help. I've tried blue/green algae, homeopathic stuff, essential oils, fast food diets, regular exercise, full vegan diet, and so on. Nothing has helped. I've been to several doctors since, with no apparent cause ("take a multivitamin", or "take vitamin D"). I'm heartened to see I might not be alone.