I have been having this issue for three years now. It first started in 2010 when I had a gallbladder attack and they removed my gallbladder. Ever since then, I have these random episodes. It starts with bloating and burps that smell like fart. Then I will start vomiting up what seems like fecal matter mixed with undigested food if I've eaten anything recently. Once the vomiting stops I will have diarrhea that looks and smells exactly like the vomit. Then the process repeats itself from a few hours up to a few days. During the entire episode I have extreme abdominal pain. The doctors have prescribed phenegran for the n/v but it does nothing to stop it or even help at all. I've had 4 endoscopes done, 1 flex sig, and 3 full colonoscopys all after (not during) an episode, and they all have come up with no answers. They found diverticuli in my colon along with polyps (negative results on those), but they said those wouldn't be causing these issues. I've had multiple x-rays, ct scans, have drank every nasty mix of stuff before the scans they can think of, and still can't get any answers or a direction as to what it might be.