Hi. Thanks for your query. Noted the history sudden pain in abdomen and need to pass the bowel movement , visited the bathroom but could not pass the motion and the pain increased so much that you had to curl up sweating and nauseated. All your history is suggestive of a disease that needs immediate medical attention, investigations and proper treatment, surgery if needed. The probable causes of such a pain are as follows: Perforation of a intestine or stomach ulcer. Rupture of some cyst or so. I would advise you the following: Rush to ER / call the emergency services or ambulance and get shifted to the ward for resuscitation of the general condition. Investigations: X-ray of the abdomen in standing position to see for gases under diaphragm. Ultrasonography and the relevant blood, urine and stool tests. If there is perforation or such a surgical emergency, you need to get operated urgently. If there is a medical reason, get the proper resuscitation and further medical treatment and get a cure.