Have you looked into Blastocystis Hominis and Dientamoeba Fragilis?
What are ALL of your symptoms?
Google the website 'badbugs' and have a read of the symptoms list.
Every had any '3-Day Stool WITH Fixative (preservative necessary to keep the parasite
around until the lab receives it) from a proper Lab (not just some common hospital stool sample)...?