Review Question - QID 212455

A 49-year-old man presents to his primary care physician complaining of heartburn and mild epigastric pain after eating for the past 6 months. He reports that his symptoms occur within an hour of eating a meal and persist for approximately an hour. He admits his symptoms have been progressively worsening. He recently began having these symptoms when he lies in the supine position. He has tried eating smaller meals and avoiding spicy food to no avail. He denies vomiting, difficulty swallowing, recent weight loss, or changes in stool color. He does admit to having a "sour" taste in his mouth when symptomatic. His temperature is 99.0°F (37.2°C), blood pressure is 149/82 mmHg, pulse is 86/min, respirations are 18/min, and BMI is 32 kg/m^2. His abdomen is soft, non-tender, and bowel sounds are auscultated in all quadrants. Laboratory results demonstrate the following:

Serum:
Hemoglobin: 13.5 g/dL
Hematocrit: 41%
Leukocyte count: 4,500/mm^3 with normal differential
Platelet count: 257,000/mm^3
Fecal occult blood test (FOBT): Negative

Which of the following is the next best step in management?