Keep me posted because this could be interesting. Since you've been looking into those worms and you mentioned that they are aquatic, there is the likelihood that you could've consumed parasitic eggs/larvae if you handled or ate fish. Just a thought.... When it comes to worm-like organisms, anything is possible for an infection. Again, some infections are accidental.
Here's a great link with a slew of parasites that Pioneer1 shared with us. You could look through this and see if you find something: