I live in America, have seen a doctor most of my life (up until two years ago.) and I have parasites. I was in the military and never mentioned it to a doctor because I was afraid of getting labeled as crazy or a health risk. Most of the posts about parasite infestations on the parasites Support Forum come from America I'm sure.
My first parasite cleanse was the Hulda ClarkWormwood and clove capsules. I felt better after the cleanse but passed no parasites. And believe me, I was infested.
Try using Paragone (which you can buy at any health food store), or try Humanworm's formula (He has a forum on Curezone.) Many foods, like garlic pomegranate, and pumpkin seeds are anti-parasitc. Also search the archives and you will find many protocols and anti-parasitic foods listed. There are many herbal formulas available in books, and on the Internet. Grow your own parasite herbs or you can buy them through a variety of sources. And don't forget zappers, they work!