raw, red, burning, bleeding vagina

i had a bad cold so the doctor put me on amoxacillin. a few days after i took it, i noticed i was getting what seemed to be a yeast infection. it was itchy and sort of burned to the touch and i had the yeast infection discharge. i found the little tube of itch relief from a yeast infection kit in my closet, so i used it because i was too afraid to say anything to my stepmom about getting a yeast infection kit of my own. it seemed to be a little better yesterday and this morning and the yeasty discharge went away.
i just went to the bathroom and when i wiped it was bloody, and it also sort of burned to pee around my labia. i took a handmirror and looked. it looks raw and near the top above my clit the skin is broken. it is dark red and swollen instead of healthy pink, but i have discharge that looks normal. all of it burns/stings to touch. what could this be and what do i do?