You're wasting time with these idiot doctors. What is the point exactly? If you want to effect them you can leave honest reviews about these doctors online. If you want to get somewhere fighting these doctors try a stool test with a lab like DGR labs, if you get a result then you can use it against them otherwise you can be labeled a 'crazy person' from these people and be worse off.
Also if you keep any evidence if parasites you pass it can be to your benefit as well. Better to have some proof on your side before going against these people or you can just be worse off and come off looking crazy.