Perhaps your manifestation is less serious. I find that after putting in long working days, I sometimes get so tired that I cannot get out of bed for two days in a row. I resent this type of fatigue, as I am normally a very high-energy person. Nothing seems to alleviate it. Rest, vitamins, nourishing food, exercise, just seem to exacerbate the problem and I eventually find myself struggling to breathe, almost as if I were not getting enough air.