What is that?!

I hear little man suddenly start screaming and crying alone in his bed. I walk over to pick him up and he's sitting in a pile of poo... with very large worms squirming about in it. Watching surgery on a double amputee doesn't freak me out... THIS freaked me out. The poor child was terrified that he was pooing small snakes from his body. I did my best to calm him and clean him up (with gloves on), but I'm still suffering from flashbacks, and they keep happening while I'm eating.