One of my last resort/desparate attempts was going to be radiation... except I'd have to find a place where I could "safely" do it. I was thinking that radiation would hurt them more then me, so it could work. Considering it works for cancer which is often caused by microorganisms, there is a clue it may work with parasites.
Also, I think that if we were to get our immune system back on track, it would be able to fight off whatever we have. That may be the trick that does it.