You could jump over to the parasite forum, but I can help guide you as it can be a bit overwhelming.
If you research it a bit you will see that the stats are @ 90% of people have parasites, they only have tests for 5%, and only 1% effective, SO with that being said you may just want to try something like an herbal tinture--I got Black-WalnutWormwood and clove from natural food store, and see if you experience die off, improvement, or evidence.
Then you may want to consider other options. If you have a dr. who is privy to them, perhaps you could get the help you need. I, on the other hand, have seen 13 drs and turned my whole life upside down financially and otherwise searching for help...said to be auto-immune, but I instinctually knew there was more. After studying them at my university this semester, finding evidence, and finding myself very ill, I turned here for help. I'm hoping that in time things will heal and there is time to turn things around.
You may not have issues, but I've found you can get them from animals, soil, fruit, veg, meat, pork carries a bad one, fish, air, etc. It is the eggs that you pick up...I believe it's pin worms that can travel through the air.