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Pretty much exactly what happened to me yesterday after three basically good days. I was fine in the morning then the exhaustion and a bad sore throat hit me again at lunchtime. Then by evening the sore throat had gone again!
This is one reason I suspect I don't have the flu, when I've had flu before (even swine flu) it was much more 'linear', i.e. the symptoms were more like a bell curve.
This thing is more like feckin Columbo!
This is the problem I've been having, I kind of warm up during the day and feel better later on, get tired early and go to bed but in the mornings I'm still exhausted.