Chances are you have various parasites & some of them will be microscopic and in the blood stream (hence helpfulness of zapper along with herbals) so that you never really see evidence of them.
Never assume you don't also have hypothyroid or hypoadrenal problems and/or maybe gluten intolerance and candida. It's a messy, nasty world out there. :-(
Don't remember if I sent you this link or not, but just in case, it has info on more than parasites...