Hello! Thank you for the query. Such symptoms can appear due to peptic ulcer indeed. However similar symptoms can be present with acute pancreatitis or gallstones. Both pancreatitis and gallstones give pain radiating to the back. The pain is usually triggered by fatty foods, spicy foods or alcohol. If your abdomen is bloated, and you have gas trapped in the abdomen, lack of stool, also bowels obstruction can give such symptoms. I suggest you to have abdominal ultrasound, abdominal X-ray, blood work, liver tests, pancreas tests, urine analysis at first. Gastroscopy should be next. Please also consider your first colonoscopy. Hope this will help. Regards.