Most people when they hear IBS, they think diarrhea. Mine is Constipation. It all started with a cold 8 months ago and the taking of a strong antibiotic,docxycycline. My colon spasmed to the point of no BM for four days. Horrific cramping. Finally stopped taking the antibiotic and had a BM but the cramping has returned periodically. Have not been able to ID any trigger foods. It feels like my colon has just forgotten how to work. It also feels like inflammation. An attack usually comes with no reason, last 4-5 days and leaves my gut feeling like I've been hit by a truck. Been having 2-3 attack a month. All the CT scans, colonoscopy, blood and stool test are negative. Nausea accompanies the attacks so I have lost 40 pounds as well. This disease has made it so I can hardly live my life. The Dr's treat only the symptoms, RX for spasms and pain. Anyone else have this experience and what did you do?