Thank you. I can't find anything online that looks like it, except for maybe a tapeworm, but even the color is different-- the pics online show them as always white and opaque whereas this is more transparent.
I emailed a picture to my doctor. A few weeks ago when I saw him, he admitted he didn't know much about parasites, and had me do an O&P which came back negative.
Anyway, waiting to see what he says about the picture.