I expected diarrhea. I ended up with mild constipation that also lead to a "blockage" in my GI tract. This blockage caused regurgitation. No nausea, sick or green feeling accompanied it. Also, no sweats or stomach acid came up. I just regurgitated food if there wasn't room for it to travel down. The feeling was upper GI pressure, severe discomfort, shallow breathing and panic. Once I looked at the toilet though, the food would come out, and I'd feel better within 30 minutes.