Some specialists can be sketchy this doctor actually examines the samples with a microscope and seems to now dedicate his practice to this testing rather than be a holistic doctor. It could be a little sketchy but I don't think the stool test is so reliable anyway cause a parasite outside the gi tract wouldnt show regardless of who's doing the testing.
Also yes Cahill is sketchy and I went elsewhere for help and treatment. Some other specialists take their time with you but Cahill specifically is pretty shady bit he's a seperate story.
It's possible after some cleansing your diet ideas could help just not when my body doesn't absorb anything no matter what I eat but possibly once it's more in balance it could help.