Three and FiveLac are good products, but they cannot fix your yeast issue alone. You should consider the Nystatin, also S. Boulardii is great and is the treatment I'm currently using.
You can purchase Nystatin from On-line Canadian pharmacies if you can't find a good doc. Fluconazole is also available. Make sure you have a good treatment plan in place before you start WWIII in your intestines.