Almost passed out this morning

So i was just about to leave my boyfriends house this morning when i started feeling sick and sweaty. I didn't want to tell my boyfriend so I said goodbye and started walking to the front door. As I was walking I started feeling weak and dizzy. I couldn't hear anything it was way to muffled then my vision was going out speratically.I remember trying to keep myself from falling over or throwing up. Once I got in my car I blasted the air since I was sweating so much. I know I shouldn't have driven under these condition but I had to be to school. I felt better after having the cold air blasting on me. Now I have had a headache pretty much all day.