I stupidly done similar, put my chronic fatigue of 2018 down to stress and overtraining. It wasn’t until circa 9 months later that I was convinced to see the doc and they did a simple blood test which diagnosed the catastrophic iron deficiency. Although I had few of the extreme classic symptoms up to that point it turned out in a test 5 months later to be bowel (colon) cancer by which time the classic symptoms were starting to show (except rapid weight loss, maybe because I was already light). At just under 43years old then that was the last thing I was expecting.
Almost overnight though once that was removed and iron was getting back into my system my energy returned which was a good job with the subsequent chemo and after that I built up for a while to 5w/kg (Its lower now).
2 Likes