Maybe u have a infection, n going down on her irritates her

Maybe that was the dumbest thing ive ever heard in my life

It wouldn't hurt to have her get checked again. Chances are her "fluids" and what not just cause you a little irritation.

Maybe you need to use some chloraseptic before you start eating your girl out..Lol not trying to be funny but you should try that.

Or maybe your just allergic to her vaginal fluids, just like some girls are allergic to their guys sperm and it burns as a result but it your case, you get sore throats.