Feeling of nausea, but followed by lightheadedness,immense sweat, and almost blacking out?

this morning i wake up and i talk to my mom about missing school because of a big test and i wasn't ready. she was saying no how i have to be responsible and i began feeling nauseous like i was about to throw up, so i walk out her room and try gagging to see if i can throw up. but by the time i get to the bathroom i realize its not vomit, i began getting REALLY light headed, my body was so weak i lost balance, my vision became worse and i started seeing more black than anything else. i tried drinking water but didn't do good.Mind you, where i live is currently at 56 degrees, and was colder in the morning because it happened at around 7AM , and my entire body was sweating. My palms were wet, and my shirt was soaked in sweat. I was trembling like crazy ,and still have dizzyness up until now. i scared the living hell out of my mom and called the peramedics but by the time they got here thank goodness i was feeling better. I just can't explain what that was. My mom says it might have been stress/anxiety from studying, also since i had inadequate sleep. i kept waking up every two hours trying to finish my work. But ive also had strep throat for some time now and i'm wondering if it couldve either of the two, or some unexplained cause. i literally felt i was going to die. It sounds a bit unrealistic but i just can't explain the way i felt and how surreal it was. Any opinions?