Try metametrix stool test. It uses PCR to detect in DNA of a suspected bug. You need to go to your doctor and he can order it for you. Like that it is cheaper than a naturapathic who will charge you an arm and a leg for the test. The parasites test cost 150 dollars. Naturapathics can charge you 750 dollars. The whole test is 350 dollars ( bacteria, fungus and parasites). You can do that test or just the 150 dollars tests for parasites.
Ask your doctor for flagyl or Tinidazol for 2 or 3 weeks tid 500mg.
If you do the test and you need help to read your results I can help you for that.
Best regards,