The best way to treat parasites is to not get them in the first place. Most of all, wash your hands. Particularly if you are going to be putting them near your face.
But, if you need other treatments you should go to a doctor. It's good to try and live a natural life, but it can be difficult to identify which parasite is infecting you (if any) and so any treatments you try at home might not work. And all the time while you delay you are acting as a host to something that could infect other people.
You might be able to live with a threadworm infestation, but maybe that baby you are holding, or the old woman next door won't be able to.
So go and get some parasitic worms treatment from the doctor before you worry about curing yourself.