I always understood yeast to be a vaginal environment imbalance.

Here is my MacGyver - style solution.
Someone told me on a mountain trail in 1984. I have tried it successfully several times and have recommended it to others who have also found it helpful. I have read it in a Women's Herbal too

Take a garlic clove
take a needle and thread - about as long as a tampon string
Up thru the garlic and down again
Tie ends together
Insert 12 hours
Repeat with another garlic for 12 hours

Voila!

note - you can prick (no pun intended) the garlic too but some people (well women people) find it too strong and burn-y