"treating parasites can take time with people that have had them for a while."
How do you know this? If you have a parasite infection, it shouldn't matter how long you had it. The right medication would eradicate it in the same amount of time regardless how long you have been infested.
Cleanses make your body poop out undigested food and it's most likely these people are simply mistaken that they see parasites. How logical is it that so many people see parasites in the toilet amongst all that muck with their naked eyes, yet hardly any of them can ever get a confirmation by experts with a microscope? Where the parasites you got confirmed the same kind of parasites (or very similar looking) you thought you saw in your toilet?
"Sure people can be misdiagnosed"
What percentage of people here do you think are misdiagnosed with parasites? I think 90% and over. Parazapper thinks 10% or less (full discloser: he sells products to people who think they have parasites, I don't).
You said of one of your parasite confirmations, the doctor said they didn't think that parasite was causing your problems. What did they say about your other parasite confirmation? Do the symptoms that parasite causes fit your symptoms?
"that doesn't mean it makes sense to go to forums of diseases or parasites telling people they're misdiagnosed."
Then who's looking out for those that are misdiagnosed? I don't see too many people here urging caution in thinking one has parasites without legit confirmation.
I hope you still take my advice that the next time you see a doctor you have them make sure you not suffering from that other health problem I told you to double check to make sure you don't have. There's no harm in checking for that.