Been there done that. Finally stopped insisting on parasites, only mentioned that anthelmic herbs made it all VERY much better. Still you can't sway them from all their tests which usually show nothing, worse if you insist on parasites you get a “crazy” note in your chart and everyone you see after that wants you on psycho drugs.
Now years later I thank God that they found nothing because if they did I would most likely be without an ileum and several feet of intestine.