how do you know parasites gone?

i thought i was puking up undigested spaghetti weeks after last eating spaghetti; i wondered how a worm could climb into my bed...it took a lot for me to realise i had roundworms. it had to be real obvious for me to get it, believe me. its nothing you think about normally...and then when i googled it i saw all these people saying tests show nothing and i thought they must be slightly crazy and imagining parasites...til my doctor's tests showed nothing despite by then ejecting loads of them courtesy of mebendazole. then i tried the albendazole protocol i found on curezone. i think that decimated them but it didnt kill them off and made me real ill - which i thought was the herz reaction thingy till i thought that cant keep continuing... it always made me so ill and like my knee joints had been axed. now i think those drugs are just real bad for you and will never finish off those worms that hide in mucus. i dont recommend that protocol, although its written so professionally. i feel much better after downing loads of diatamaceous earth and good bacteria to try to change environment but i still have some signs - the occasional out-of-nowhere cough that i think is larvae coming out of lungs; blocked ears, which used to be real bad but now only very occasional, that i think is lost larvae; worm like material in stools though not the obvious long worms; some bloating and wind but not like before but still not normal. i have other symptoms that i'm not sure are symptoms: bloodshot eyes; solid white stuff that i wonder whether could be larvae coming out of eye ducts and nose, but i think i am so clean i cant understand how i can be reinfected all the time (btw i live in china); and a fat tummy when the rest of me is dead skinny. you know, after a big roundworm infection, one can go slightly crazy so i dont trust myself anymore... anyway, my question is: how do you know when they are gone? its such a dirty secret to carry around and i want to feel like a normal clean human being again. is the fact i'm asking, innate knowledge that i still got them or has the experience left me paranoid? is the diatamacous earth working or are they free to repopulate without the drugs? and how can i keep getting reinfected when i scrub everything like crazy? all thoughts appreciated...