No other symptoms. Pt describes pain as being in stomach area. Pt is 69 y/o male taking lipitor and atenolol. Pt has history of ulcers, hemorrhoids. Vomiting (dry heaves) began approx 4 days ago but lasted only for a couple of days and then went away. About the same time, Pt had a couple of episodes in which he passed noticeably dark stool (upper GI bleed?). Pt describes "stomach" pain that waxes and wanes, and began to improve gradually on day 2 and 3. Morning of day 4, patient palpates his own abdomen and immediately falls to his knees in pain, describing it as a 10/10 on the pain scale, "the worst pain I've ever had." Pt is admitted to hospital. Pain gradually improves and patient no longer needs any pain meds. Abdominal ultrasound unremarkable. Liver enzymes (AST/ALT) elevated. All other bloodwork, including pancreatic enzymes are normal. Pt is married in a monogamous relationship with no outside sexual history (partner has no symptoms and is likewise monogamous). Pt denies being exposed to blood or other bodily fluids. Pt has no history of alcohol use. Yes, I realize this is limited info. Give me your diff dx and give +/- for each possible diagnosis.