What Is The Treatment For Vaginal Discharge And Swollen Labia?

Hi,

I started taking Cephalexin 500mg capsules (i took four of them) for a spider bite that had not healed. I took the same ones previously before and they had given me a yeast infection. A few days after taking them i got very bad itching and a thick creamy discharge and my whole labia and clitoris felt swollen. it progressively has got worse to the point i cannot sit down, walk around. it is incredibly painful to touch and incredibly painful to go to the toilet. However today 5 days after all these symptoms i have got a pimple like rash on my inner thigh/bottom and noticed small bumps in my vagina but these do not hurt to touch. But now i am worried i have herpes and not a yeast infection due to the presence of the bumps.
i took a treatment tablet for thrush 48 hours ago and have been putting cream on, but i accidently in my painful state grabbed my BACTROBAN MUPIROCIN cream for my spider bite and had put that on my vagina instead of my thrush treatment without realising until a few hours later. Could this be the cause of the rash. Im so scared.
I have only had unprotected sex with two people and both have said they are clean of all STDS and neither had any of the symptoms of herpes. My current partner does not have any symptoms and has never had any symptoms.
could this be a bad yeast infection? i've red the bumps could be a bad yeast infection reaction. Please help