My husband throws up every meal. He has had three colonoscopys, had several blood tests, an mri on his pancreas and an endoscopy. The doctors (5) all say irritable bowel syndrom. He did work in a prison in florida and has been tested for parasites. Don't know how many parasites or if there can be several different strains. My husband is losing weight - practically starving to death - has anybody heard of such a thing??