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YCan't work out anything, blood results show my red blood cells are abnormally low, which usually means anaemia, but have too much iron? GP says he hasn't got a clue it just dosen't tie in.

That sucks, try a new doctor. At least you have your crosshairs on what could be the cause for your problems of chronic fatigue. There's gotta be some underlying condition causing that, and a good doctor wouldn't just call it quits/ just shrug it off as an anomaly