Highschool: Nystatin

Need Advice for Treating Thrush

My now 2.5 month son has had thrush since he was 2 weeks old. I took him to the doctor and he was prescribed nystatin. It helped but it never really got rid of the thrush. So now he is on his 2nd treatment w/ nystatin but it doesn't seem to be doing any good. Is there any other way to treat thrush w/o having to take him to the doctor? Perhaps a natural home treatment? sorry I forgot to mention that I am bottlefeeding. And have been sanitizing the bottle nipples and his pacifier.