When I Eat Processed Ham Such As Packaged Sandwich Meat

When I eat processed ham such as packaged sandwich meat or pork ribs slightly over cooked in areas around the edges and other random items I get very ill. It starts with terrible sour belches and that stands as a warning that I am about to be very ill for the next 24 - 36 hours. I will have diarrhea and be vomiting very intense. This is not just a mild stomach problem. I avoid items that I know will cause this but i still find a random item that has this affect. I have read that there is some enzyme found in the packaged ham and that is developed when th pork is burned that causes this problem. Any ideas?