It does sound like a yeast infection, or vulvovaginal Candidiasis, and there are some over the counter medications that help solve the problem, however it appears that you need a stronger medication. Dyflucan is probably what you had as a one day dosage, and you may need to have a culture of the discharge to find the correct medication, do NOT have sexual intercourse during this infection, it will only complicate the treatment, and infect your partner.