I, personally, have showed symptoms of fatigue. Very followed.
It was an exercise and, after doing so, within 20 minutes, I was starting a tachycardia incredible; it will not stop anything. Then, my heart is calmed and quickened. Thing that, particularly, I got tired of the excess.
Another thing was that I was dizzy a lot; when I get up from somewhere where it was with the view on high, I was dizzy; the view is me misty, but I never fainted. I hope I never get that far.