I think I've just passed a parasite. It was about half an inch long, relatively thick compared to the length; on one end it was thinner.
I'm on my 10th day of parasite cleansing. Before I've started it I was taking grapefruit extract drops, and after a week or so of this treatment I've passed something that looked like a parasite, it was maybe 3 inches long.
If someone is brave enough and has experience in this I have a picture of this last (half an inch long) thing.