So I started of earlier this week with what looked like a yeast infection white discharge came out all the usual I treated it and it seemed to go away I had sex the day after while having it I felt a very bad pain the person I was with seemed to have slightly cut the bottom part of my vagina I let it pass and now 2 days later I have several little sores that look like skin burns like when you shave and they hurt so bad they all between my vagina and anus I’m really scared at what it can be it can’t be herpes because I tested negative and my partner doesn’t have it

Please help