When you say you have pin worms, is it that you have an itchy butt and have seen them in that area? A way I tried years ago to relieve this (and it worked) was to do a rectal implant of pure neem oil. This stopped the itching immediately and after a few goes at this (can't remember how many) the problem went away. I think it kills them on contact, at least that's how it seems.
I don't know exactly what parasites I have, but for the first time in over a decade of trying, I got some liver flukes out, this week. I have mega mega resistant parasites and nothing has budged them over the years, so I am very happy to finally be seeing some in the toilet, but I feel there are a lot more where those came from, mostly in my liver. I am guessing (could be wrong) that my bowels are relatively parasite free these days, as I keep them very clean and never see bowel type parasites, except for candida strings a few times.