What Causes Sudden Dizziness Followed By Fainting And Pale Skin?

(i am a 16 year old woman) yesterday i got out of the bath and started to feel sick so i sat on the toilet. i then walked out of the bathroom to get clothes (my mom told me to stay there cuz the neibor kid was over and she'd get my clothess) so i stood in the hallway by the bathroom and all of a sudden i got really dizzy and everything went black and the next thing i know im laying on the floor and my mom is asking me if im ok. i could hear her but couldnt react. once i could i told her i was ok and she helped me up. once i was reactive enough to get dressed, i did. i went and sat on the couch. my mom told me i was shaking and my eyes rolled back in my head. i was pale for about 15 minutes after this happend. what could this have been? could i have epilepsy? (my grandma and cousin have epilepsy. could i have inhairited it from my grandma?)