Couldn’t see (everything was white light), hot & sweaty, very dizzy & faint, disoriented, sugar helped?

okay so something weird happened today
(btw, i’m a 15-yr-old girl, no weird health problems, no medications, no drugs or anything)

so i was walking outside (i’m on vacation in los angeles) and all of a sudden i was really hot and tired and wanted something to drink, even though i’d drank 2 whole bottles of water about an hour ago and it couldn’t have been more than 75 or 80 degrees.
it progressed really fast. all of a sudden my eyes couldn’t focus, it was like dots of white light were filling my vision and i could barely see. i could see things that were up close as washed-out shapes, like sillhouettes, and farther than about 10 feet i couldn’t see anything.
i got REALLY dizzy and disoriented, i walked into a lot of people and all i could think about was getting out of the sun. i kind of stumbled into the nearest cafe but i felt SO out of it all i wanted was to curl up on the floor and go to sleep. i thought it would get better once i got out of the sun but it didn’t, it was TERRIBLE…not to be overdramatic but i literally wanted to die. i just felt terrible and heavy and fuzzy and hot and i was sweating a lot and i just leaned against the counter for a while and i couldn’t see anything. i don’t really remember how long i was there, ten minutes maybe? i think i sat or lay on the floor at one point, there was almost no one else there. i think one guy asked me if i was okay but everything felt really far away and unimportant. finally my sister came in and sat me down and got me some ice water, she had no idea what was going on either. i drank two or three cups of ice water but it only helped a little bit. finally she got me some orange juice. i don’t know how else to explain it but it was the best thing in the world. i just remember that it tasted so good and sweet and i drank like four glasses of it. after that and sitting with my head down for a while, i started to feel better. my vision cleared up a bit and i could think again but i still felt pretty crappy. i went from burning hot to freezing cold, even though it was really warm, and i felt nauseous. when i stood up or even sat up straight i felt really dizzy again so i stayed sitting for about half an hour. i was still really woozy and sensations felt weird…the orange juice tasted weird and when i touched things they felt wrong. according to my sister i was talking nonsense, apparently i said a bunch of crap about nail polish and was obsessing over paying for the orange juice, i don’t really remember it, it’s all kind of a blur. anyway, she called my mom and maybe 45 minutes after the whole thing started she got there. i lay down in the back of the car. when we got home i was feeling better but i was still really dizzy, i couldn’t walk in a straight line and it took me about 5 minutes to get up the stairs. anyway, i got upstairs and lay down and went to sleep; i had about a billion blankets because i was freezing cold. i woke up a couple hours later and ate dinner. now (about six hours after the whole thing) i feel a lot better except still kind of weak and shaky, and i have a pounding headache and i think i might have a fever. but relative to before i feel awesome haha

anyway, i have NO idea what happened, and if anyone knows please tell me! it wasn’t hunger because i’d eaten a big lunch about an hour before it happened. but the thing that really stands out to me was the orange juice, that really did the trick…maybe i needed sugar? i don’t know. this has only happened to me once before, it was at least 4 years ago and not NEARLY as bad. i was standing outside and all of a sudden things got bright white and i was really hot and i just started whining and saying i needed to get inside, but the SECOND i got inside it got better.

what happened??!?!?!?! please tell me!
thanks!

NOTE:
i also put this question in the general health section, but i’m putting it here because i remember i read a book about this girl with diabetes a long time ago and she said that when it started she was just really thirsty and drank like three cartons of orange juice.
i don’t know much about diabetes but i know i’d already eaten, but it was the sugar that helped, so…ideas?