The way to kill off yeast is to drink much (fresh as possible) grapefruit juice, secondarily cranberry. Acidifying your PH renders your body hostile to yeast, which needs an alkaline environment. Think: there is no such thing as orange wine or lime or lemon or cranberry wine, etc.
When I was 15 playing soccer (both before and after school) I got hooked on Dunkin' Donuts coffee, and drank barrels, and developed quite the yeast infection. Ick-ee.
It was late, and I was in pain....apologies for my not catching that.