Hi, thanks for posting your concern in the HCM. Abdominal cramps with bloody diarrhoea and vomiting may be due to acute gastroenteritis or colitis or enterocolitis due to some infection. Less commonly, they may be manifestations of more serious conditions. Usually fresh blood in stool are due to lower gastrointestinal tract pathology. Diverticlar diseases, inflammatory bowel disease, rectal pathology ( abdominal cramps are less likely) , carcinoma ( for persistent early morning bloody diarrhoea), coagulation abnormalities, should be ruled out. Among the infectious agents VTEC, C jejuni, C difficile, Shigella, some forms of Vibrios, some viruses are notorius for this. Food poisoning also needs to be ruled. My recommendations are- maintain good oral hydration with plenty of oral fluid and ORS, visit the ER of any hospital to get assessed for the need of in patient treatment, If the cramps are still severe, you can have drotaverine 40 mg for symptomatic relief till visit to the hospital, Ondansetron 4mg sublingual tab for vomiting. Antibiotic treatment and iv fluids may be considered once you visit the hospital. Prior to start of antibiotic several investigations will be done including the routine tests. Furthermore, the light headedness and sweating were perhaps due to transient sympathetic overactivity due to the underlying problem itself and will be corrected once you come round. For any further query please write back. Regards.