You may have a different problem that's causing the parasites by suppressing your immune system: mercury poisoning (from dental Amalgams or "energy saving" light bulbs). I was cured of this condition by chelating using the Cutler protocol by Andy Hall Cutler, PhD PE. It's the only protocol that is safe to use. If heavy metal toxicity is the problem, you can rid yourself of the parasites all you want, they will keep coming back:-(
Let me know if you have questions (in PM if you wish)
All the best.