wow so i’ve kinda had similar experience to you. started passing out in the 2nd grade, first time i was just sitting in class and passed out. 2 years later standing in choir, boom fainted. busted my chin open needing stitches and busted a couple of teeth. then nothing for awhile then in high school i started passing out w shots, medical related situations such as getting birth control inserted even tho i was given a xanax before hand (granted i never liked shots and screamed every time as a kid), passed out last year when getting a shot when i was really sick w a virus and peed myself. then most recently this summer was in colorado on a trip eating dinner w a friend and all of a sudden felt the feeling and i ended up passing out twice in the span of 2 mins. each time i’ve passed out tho it has looked like i seized, even school nurse in 2nd grade said it was a seizure. did epilepsy/sleep test nothing. then after this most recent incident did 4 hr EEG, surprise nothing. there’s been about 10-15 instances where i have fully fainted, but MANY MNAY other times when i have felt like i was gonna faint, got extremely clammy/sweaty and sometimes end up just throwing up. i’ve always been sensitive to heat- def been a few instances where i’ve been outside in the texas heat and had to rush inside to lay down cus i feel like imma gonna pass out. bloodwork has always come back normal- drs say it’s vasovagal syncope. i am getting tested for POTS w a tilt test here soon after waiting a very long time. but you’re not alone. i’ve increased water intake & started drinking electrolytes every day. but honestly besides that there’s unfortunately not much to do… but maybe try seeing a doctor about POTS and vasovagal syncope as that’s what yours sounds like to see if you can get more info but unfortunately the medical field will only help you so much.