I have undigested food in my stool all the time from whipples disease because the small intestine isn't able to break down the food properly and absorb the vitamins and minerals the body needs. Keep an eye out if you start losing a lot of weight and not being able to eat at all it could be a sign of it. Definitely sounds like you got something from the lake or the tap water you drank or the pork too. You could have gotten worms or bacteria from anyone of those sources. Scary times we live in right now. There are millions of people in our country suffering from the same issues and big pharma just covers it all up to keep their bankids roll hefty.