You're not being a hypochondriac, you are just discovering that modern medicine no way has all the answers.
Lab tests are often wrong for parasites. I was told I had none, then for 3 months, with paracides, expelled tons of them.
There is a kind of parasite, but I forget what kind, that kind of looks like a piece of a nut. Maybe that is what is in the picture, not sure.
Regardless, you probably have parasites as virtually everyone does - if not everyone. You and your family, too, sorry to say.
Hulda Clark said everyone she ever tested had Tapeworms & other kinds of worms also. See
the link below for the cayenne pepper challenge test to see if you have them. Ditto any family members.