Why did i ped out during sparring?

Yesterday i ped out and today i ped out AGAIN! I skipped lunch today but i was planning to eat after kickboxing cl anyway, Me and my partner was sparring was sparring (although it was more of a match), I was winning but my gloves and my legs suddenly felt so heavy and my vision started to blur and i started blacking out, (I wasn't dehydrated or anything) and well the guy started pounding me like crazy, Thank goodness my teacher realized something was off and stopped the match, I woke up and realized the cl was over and i couldn't talk to my teacher cause he was already teaching another cl so i decide to go home