There's a link from a Lyme sufferer whose critters were sent to the CDC. Same critters as yours, and as mine. I passed a lot of it since taking salt. A friend of mine also passed tons of these unknown bugs when taking salt.
I'm very interested whether the CDC has an answer, but I suspect they have none.
I personally think it's a special kind of stage of any sort of flukes; but I can be totally wrong.
I also feel horrible, especially on fullmoon and new moon.