The probiotic in the yogurt that helps with yeast infections is called acidophilus. You can buy it in pill form and take that instead of eating yogurt with live cultures. Not all yogurts have it in them so check the labels carefully.
Or if I were you I'd try another dose of Diflucan. More than likely you needed a stronger dose. That's all. I've had two yeast infections my entire life because of antibiotics. Both times it was cured with diflucan within 5 days after I took the antibiotic.
also, yeah... make sure you dont have sex for a week after you take diflucan or until the signs and symptoms are completely gone. Use condoms for a week after, and make sure your boyfriend/lover/whoever doesnt have it, too. Then it'd be an endless cycle of passing it to each other over and over.