I have the common symptoms of IBS--pain in lower left abdomen, alternating constipation and diarrhea, but I also have nausea which occurs sometimes mid-sleeping and in the AM. I literally feel like I could throw up. I went to my gastroenterologist's office late last week and they put me on Bentyl, stool softeners, and Fibercon. I have had colonoscopies and endoscopies in the past couple of years and routine bloodwork. Can nausea be a symptom of IBS?