Why bother with the nurse & doctor? Maybe get another doctor, but it may be no different. He or she has probably had no training in parasitology & is sitting there clueless to the bugs in his or her own system. There is a kind of mythic feeling in this country that mostly only 3rd world people have parasites. On top of that the testing is generally just of the stool, and parasites can move away from stools, be embedded deeply in the intestinal linings & certainly don't restrict themselves to just the intestines, as you know.
I don't think you probably need medical help for this issue. Many people, including me, have gotten rid of tons of parasites using the standard herbals, zappers & or Rife, also the Sota Pulser. It takes time. Maybe several months, maybe longer. Die off can make it pretty unpleasant. But it can definitely be done. Just keep on keeping on. You are smarter, bigger & stronger than the bugs are and the paracide tools are out there.