Fair time

I went to the fair tonight with some friends and my boyfriend! I was fine, and then after riding a couple rides, I started feeling weird, not right. I started having some pressure in my vagina, like I was constantly trying to pee. Then I started getting real kinda light headed and dizzy. I just feel really unlike me. And I'm never this way after fair. This is the first year I've felt like this. Any ideas what it could be?