What Causes Heart Palpitations With Sweating And Syncope?

hi i'm a 20 year old 5'8 135 lb female with no medical history. Two days ago i was sitting in class and started sweating, my heart was racing and i felt like my whole body was tingling and got very dizzy all of a sudden and then i couldn't see or hear anything i put my head down on the desk and i passed out and they said i was shaking a little bit and might have had a seizure. After i came too i felt fine just a little fuzzy and confused. Since it happened i still feel a little dizzy, tired and out of it, and my body will start tingling all over again but if i start breathing faster or drink alot of water i'll feel normal again for a little bit. They told me it was because i didn't eat anything that day but i ate before class today and i still felt like i was going to blackout again. Do you have any ideas of what could cause this?