I felt really sick last night. I was diagnosed with IBS about a yr ago. I've had all the tests. Last night I had a really rapid, strong, fast hearbeat. I had some mild chest pain on left side, and I have had some arm pain for a while. Also, I had chills and some shortness of breath as well. Well, I had stomach discomfort, and I could tell my colon or intestines were moving around inside as well. I had to finally go to the bathroom for a bowel movement. I didn't feel a whole lot better, but just slept upright the rest of the night. I have been to a cardiologist, and they gave me a echo, my cholestrol is fine, I'm very thin, I don't smoke, or drink, so I have no risk factors for heart disease. I ate a high fiber cereal before bed last night, and drank water. I don't understand, pls help.........................