Hope, you'll find that you know more than your doctor. parasites is a single unit taken during medical school and I don't even know if its a core unit or an elective unit. Many doctors don't even know about parasites!!!
Personally I had a really bad experience having a procedure looking for parasites. And this is what most doctors will do.. procedures such as scopes, colonoscopies, or imaging which finds nothing. I had a scope down the throat and into the stomache, and it caused them to migrate over the top of the roof of my mouth. It caused even more issues for me. I don't expect a colonoscopy will do the same type of damage, but I myself will not have one due to my experience with "medical procedures".
Have you heard of the cayenne pepper test? You can do this to find out if you are carrying tape. Hulda Clark said everyone she ever tested had one...... so that's good enough for me.