Three hours after alcohol binge drinking, a 39-year-old male…

Three hours after alcohol binge drinking, a 39-year-old male has severe epigastric pain radiating through to the back. He is vomiting. The patient’s blood pressure is 105/70 mm Hg, pulse 115/min, and respirations 24/min. Examination of the lungs and heart are normal. Epigastric tenderness and decreased bowel sounds are noted. Which of the following is the most likely diagnosis?