A 45 year old CEO presents to your clinic with complains of severe heartburn and upper abdominal pain that have been present for the past few weeks. Pain is slightly improved with OCT Prilosec and TUMS, and better with meals, but between meals pain is severe. Which diagnosis in your DDx is most likely? A. Duodenal ulcer B. GERD C. Gastric ulcer D. Esophageal stricture E. Achalasia