Unfortunately (or unfortunately) dietary changes are essential in the treatment of yeast infection. This is more like a lifestyle issue, I think.
Also, start thinking about your immune system. Yeast is a opportunistic little health questions and if your immunity is low, you're more likely to develop more yeast. And, experiment with some remedies. Here are some I just came across that I'm going to look into:
Boric Acid vaginal suppositories
Garlic vaginal suppositories
Garlic supplements (oral)
Warm bath with tea Tree oil (Melaleuca alternifolia)
Douce flush with Goldenseal or Oregon Grape Root tea infusion
Pau D'arco supplements (oral)
Potassium Sorbate paste applied locally (used to stop growth of yeast in beer)
Slippery Elm paste to treat vulvular itching
I'm also going to look into a product called Vitaclenz which helps kill off candida and unwanted parasites...but it looks expensive.