I had a vaginal yeast infection 2 weeks ago. I used itraconazole 100 mg, 2 pills per day for 2 days. The infection seemed to have disappeared. Also my boyfriend that I have intercourse with used fluconazole 150 mg 1 pill per day for 3 days for protective measures. Now, after 2 weeks, the infection came back again. What should I do? And why it keeps coming back?