while supplementing with additional cultures, like noted by phil, for 2-3 weeks use a strong tea or concentrate of Umeboshi Plum (Japanese smoked plums). It will help rid the body of excesses of yeast, clean the blood, clear the skin, and alkalyze the body.

adjusting body alkalinity will largely rid the body of wrong yeast balance. Adjust with probiotics, like Phil mentioned. Kombochu Tea is a good thing to learn to grow.

Triphala for regulating gut and rejuvinating is good. It may also be good to look into "po chai' (curing pills), a chinese herb supplement

colloidal silver and zinc is good to take too. trace minerals are very useful.

plenty of alkalized water (maybe just a pinch of epsom salt in a gallon of water) and/or a bit of himilayan salt. use any ph test kit, to arrive at a value just slightly above the middle @ ph5

eat lower amounts of yeasty foods in the process - like make sure the bread is fresh and organic and full of coarse grains, not the usual fair. A tablespoon or two of organic vinegar is good - (what i like, is to let a potent batch of kombochu tea go 'bad', then i have kombochu vinegar) - about 10 or 15 minutes before a meal.

needless to say, cutting down or out, sweet things, will help starve the excess yeast. For some people, Chromium and Vanadium (trace minerals) are very good in regulating yeast balances (like beer and liquor, and desserts)

slowly promoting good digestion, not with complete raw foods, but lightly heated ones, will help develope a good digestive tract (raw is good for detoxing, but not in this case), with plenty of friendly bacteria to take the burden of the excess off your system.

have some fragrant seeds for tea - like anise, fennel, caraway, cardamom, dill etc, for if you build a good gut flora, you will have lots
of gas/fermentation in the process of building it, and the majority of the stress of that can be aided with the fragrant essential oils present in aromatic seeds

tepid tumeric tea/water