what kind of doctor are you seeing? My GI doctor prescribed Mebendozole, which never really worked totally. (for pinworms) Its the generic of Vermox. This is his only medication. I have tried to see other doctors, but they won't really diagnose me.
Have you tried any parasite cleanses like Humaworm? What about doing flushes, like liver flushes, or salt water flushes, or enemas?