Hi, I just discovered a black parasite in my stool floating in the toilet bowl. I've been feeling really light headed with a loss of appetite for the last two weeks. I ate pepper squid at a local cafe' last Thursday. Could this be related. It was the size of a normal bug, had many legs and floated in the bowl. I'm really worried, I've been feeling really lethargic the last couple of days experiencing constipation. Please could you help me out? Thankyou.