was it worms????

This is gross, but I would love to have an answer. Flush before last I passed 3 Gallstones (about the size of a very large pea) and embedded in each one were about 10-15 black "threads" about 1-1/2" long! They were the diameter of heavy carpet thread. I should have taken a pic, but I was soooo sick!! Any thoughts?........lp...... Tweet