According to the symptoms you reported, you might be experiencing post infectious Inflammatory Bowel Disease. The symptoms of post infectious Inflammatory Bowel Disease include two or more of the following: fever, vomiting, diarrhea, or positive stool culture. The infection that caused this condition might have been too light and you did not even recognize it. The Inflammatory Bowel Disease is a functional bowel disorder and no signs can be found with most of the visualization tests you reported.
You might want to visit a gastroenterologist and have him check you for the suggested diagnose. If confirmed, he might recommend adequate therapy (antidiarrheals, serotonin-antagonists, antispasmodics).
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