Are you taking anything else besides the cayenne? Sounds like a good idea.
I haven't seen anything that you've described, but it's hard to describe these things sometimes.
I found some things the other day that looked like Celery strings. When I first looked at them they looked like worms, but they felt hard, not squishy. I hadn't eaten any Celery and then I realized I had pea pods for supper the night before. You definately do not digest the strings! I got a good laugh out of it and was glad they weren't worms, because there was alot of them! :)