I realize this is an old thread, but I'm posting this here for the benefit of anyone else in the same situation.
I have had bad reactions to Zeolite too. It made my candida worse, not better.
Apparently Zeolite is an alkaline substance. Alkalizing the digestive tract will make it easier for candida to grow.
Another anti parasite substance, Diatomaceous Earth (DE) is also alkaline. So if you're taking Zeolite or DE, you're going to be encouraging candida growth in your digestive system.