What was happening to me?

Yesterday i had a school carnival, n i live in south jersey so yes.. It was hot about 90 degrees, n i drank water throughout the day n it was all day, i went under no shade n i only had cheetos, a hot dog, and soda for lunch, once we got back into the school i had a unbearable headache n i felt like throwing up then i went to volleyball where i got more sweaty but i didnt participate. I knew i was at my breaking point bcuz i started crying, my dad picked me up n when i got inside my house i cried more bcuz of my headache, i took some medicine n my mom told me to take a lukewarm shower, once i got into the bathroom i sat down n i was so shaky, i kept closing my eyes i felt as if i was about to pass out, n i had rapid breathing, so i finally got up took a shower, went downstairs n my mom forced me to drink water, n i laid down on the couch n i just wanted to sleep, less than 30 seconds of being on the couch i passed out, it was an hour and 30 minutes later when i woke up i had 2 hot dogs, some chips n a few sips of water, my stomach was tight n swollen, the nausea went away but i still had a headache so i took more medicine, my mom then decided i didnt need to go to school. I think i was dehydrated, i had heat exhaustion, n maybe i had heatstroke or i was on the verge of it, but idk, so what was happening to mee?????? It was by far the worst day of my life, i just wanted to die.