You probably have seen my post from September. When I asked everyone said it’s meds. I am still taking them but somehow that terrible constant fatigue comes from time to time only now. Are you on any meds? I don’t know what changed. I suspect 16 days of prednisone when I was sick in July could affect me that way. I see an immunologist and she checked my IgG levels- results were much below norms so I started taking IgG supplement and metavitB12 shots once a month since it was very low as well. My tests will be repeated mid January. But the fatigue is not my issue at this point. It looks like it hits out of the blue.