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I would also suggest a stool test also. It's really not that bad, you just collect in a sterile cup a walnut size piece of stool. I know a guy that had a normal colonoscopy/bloodwork and later found out he had c-diff. He had it for 6 months before it was found on a stool test. He didn't have any nausea or vomiting either. May want to include giardia in that test also. Some doctors just automatically jump to IBS if you can't be diagnosed. IBS is a diagnosis of exclusion, can't be diagnosed until all other tests are normal.