Hi. My symptoms of IBS-C are just unexplained constipation, and usually pain before having a bm; pain goes away after bm. From what I've read and asked, doctors tell u you have IBS after a normal colonoscopy. It's all stress related and I have a lot of that. In my case, I had suffered from IBS-D since I was very young. I had never seen a Dr. about it--simply thought I must have tons of "food allergies". But after the birth of my second child, I started to experience this terrible constipation. I exercise, eat healthy and drink plenty water. So, I decided to see a gastroenterologist and got a colonoscopy; results were normal (healthy colon). So, I started to take chelated magnesium, citrucel and increase even more fruits and veggies intake. I don't have any of the symptoms you describe. From what I've read Crohns disease is an inflamation of the colon. Good luck to you.