Fasting to kill parasite

I have tried anything an everything for my intestinal parasites, from herbal cleansing to 3 different doctor prescribed drugs. The stool tests from a travel medicine infectious disease specialist say I dont have parasites, despite that I am very clearly excreting several of them in every bowel movement. The only thing left for me to do at this point is try an extended water fast. I have done The Master Cleanse for 10 days before, I think I am willing to try a few weeks of nothing but water. I figure they will starve to death before I will. Has anyone else had experience with complete fasting killing their otherwise invincible parasites? Does anyone else have any suggestions? I am at the end of my rope here.