Whenever I do most exercise or pe I become tired

Patient : Whenever I do most exercise or pe I become tired really fast ,even though I run lots, I become weak in the muscles under my knees some times it goes higher but not often it causes me often to fall.when I sit after/a bit after my friends say that my eyes beguin to close and I loose focus and go into s daze and stare off into space, it often happens at random moments when I have done nothing, it takes i while, 1-8 mins to realise what I am doing sometimes it happens at awkward moments and I trip of stumble. Why does it happen? Can I stop it?
Symptoms:  Symptoms: daze, falling,weak muscles, tired ess
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