Is Rife the best tool to fight parasites?

OK, but what if your never diagnosed with the exact thing, than you'll just be guessing!! I had special stool samples sent out to Genova, thinking for sure it will detect something, and today I find out the preliminary reports are NEGATIVE for parasites. What the heck? I mean like I feel worse and worse every day. So how should I proceed with Rife or a zapper if I'm not officially diagnosed? will always be guessing at the frequencys and that could be so much time wasting.... I know I had pinworms, and there at least 2 other things. but what? Probaly a lot more.