Yes- self dx is always a problem, I always push for proper parasite testing, in which IMO there is only one which is Metametrix.
Yes I think the DE may be helpful in early infections, but in longer standing infections they are going to resist.
But what is worse, an untreated parasite infection which can develop into cancer or a weeks worth of drugs? You can get the drug residues out of the body with many natural things as you know.