Yeast Infection

Hi all, I've been struggling with a yeast infection for the past few months. I was wondering if some ladies in Australia could tell me which is the best medicine to get. I have taken the one pill, which didn't work, and the cream, which only worked for a short while. My doctor said to try a longer pill pack and see how I go. Any ideas for which brand, and do they do 7 day pills? Thanks in advance x