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You may have an inflammatory bowel disease since this is ongoing and you have also had some abdominal pain with it. Mucus in your stool can signify IBS (irritable bowel syndrome) or UC (ulcerative colitis). Of course, you will need a Dr examination to confirm this but mucus in the stool and diarrhea is suggestive of it. Also, recent antibiotics can cause C. difficile. One will see C. Difficile occur after a round of antibiotics. Gallbladder will cause you nausea/vomiting, and pain in the abdomen. The pancreas involvement would produce signs such as upper right abdominal pain, vomiting, nausea, pain that radiates to your back, and abdominal pain that is somewhat relieved by the act of leaning forward. Liver problems can also cause abdominal pain, but we really don't see stools with mucus when the liver is being considered. H. Pylori is sometimes a culprit of abdominal pain that is relieved by eating. H. Pylori is a bacteria that is responsible a lot of the time for the development of peptic ulcers. When the stomach is empty, the pain would be worse with PUD (peptic ulcer disease). H. Pylori can invade the gut and cause nausea, vomiting, belching, bloating, abdominal pain, weight loss (due to lack of appetite), and even tarry stools (none of which you have listed but abdominal pain). So, really, yours is a process of elimination here. Most of your symptoms are pointing to some sort of inflammatory bowel disease since it has not resolved since 2 weeks on onset. I would suggest that you let your Dr test your stool once again for bacteria (white blood cells) and also ova and parasites (routinely done on someone who has had diarrhea for 2 weeks) and then possibly a colonoscopy if this continues.
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Yes, a fast transient time of contents through the bowel can lead to a yellow-green stool because the time spent in the large bowel is not enough to absorb the compounds that make the stool brown. However, this has been going on for 2 weeks even with you modifying your diet and also you have mucus. IBS can cause a fast transient time and also can include mucus. A viral infection (gastroenteritis) is not out of the question, but normally it resolves quicker than 2 weeks (not always, but most times). Stool cultures are only valid after the symptoms start, so if you have not had a stool study done in the last 2 weeks, the other results do not apply. Blood tests can determine if you have pancreas involvement (amylase) and also an ultrasound of the abdomen can visualize the GB, liver and pancreas. I would say if your symptoms persists for a couple of more days and you are still on the BRAT diet with no success, it would be time for a Dr visit. They will start off with some blood tests and the stool study, then the other tests will follow depending upon clinical findings and examination.
Oh ok, I had no idea you have had the stool studies done in the last 2 weeks. That rules out ova, parasites, and C. difficile then as they would check for these first. Sounds like your Dr is on the right track with ordering the colonscopy and endoscopy tomorrow. He/She is probably trying to rule out the inflammatory bowel diseases then.