Are you sure they saw them? My suspicion would be protozoa which are microscopic in which treatment protocols would be different. The problem with parasite testing is that unless they can absolutely match them with known parasites, you get a negative. Metametrix offers the best test (panel #2105).
I know someone who has gotten good results using the salt and vitamin c flushes (associated with the Lyme protocol in case you want to look it up) also does salt water enemas and got worms out.