hey
you may have candida, which means you are really suscetable to thrush. you can change your diet and reduce the amount of yeast you eat and this will reduce the chance of the thrush returning. have a look at this
http://www.goodnessdirect.co.uk/cgi-local/fram eset/article/140.html
there is loads of info out there, just google candida, and anti-candida diets.
i went to my local health food shop and they explained all the above to me, i went in cause i got sick of it returning and wondered if it was anything in my diet that was causing it. they recommended i follow the candida diet and also take this vile stuff called Molkosan, which is a liquid you add to water. it helps balnce out all the bacteria in your body and discourage thrush from returning. as i said, it tastes disgusting but it really helps. once its cleared up, make sure your husband is treated too cause you could just end up going round in circles!
if your still unsure go to your local health food shop and have a chat, their advice helped me no end.
x