A lot of doctors are idiots. Keep in mind you can possibly shop around if you have insurance or find a doctor that knows about parasites online though it can be a mixed bag as to whether you get results or not. Can look up things like parasite or tropical medicine doctor and the city you're in. Also can sometimes look up doctor reviews depending on where you are. In the U.S. Its common for doctors have reviews of them online.
Antibiotics can also release underlying infections. It was after I started treating lyme with Antibiotics that all this parasite **** started happening.