Diflucan not working?!

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I used to get chronic yeast infections so I have several diflucan pills from when my doctor used to prescribe me lots so I wouldn't need to come back in for a visit each time. I haven't had one in quite a while until a couple days ago when I finished a round of antibiotics (of course!) Anyways I have taken 2 diflucan over the last 2 days and it has not helped at all. I recently started taking lamictal for seizures and I googled and there may be a drug interaction? Anybody have this problem? Or good advice?