Use the knowledge of the pathophysiology, etiology, and common presentation of diseases with nausea and vomiting as a primary symptom to accurately interpret the diagnostic process to advise regarding the most appropriate prescription therapy.

Edwin Bourke, a 40-year-old Gulf War veteran presents with a 36- hour history of nausea and vomiting with intermittent abdominal pain. His past medical history is significant in that he received a penetrating abdominal wound from which he fully recovered 15 years ago. He also complains of a headache, chills, and general arthralgias and myalgias. A review of his chart reveals a dental visit 2 days ago, where he received prescriptions for erythromycin 500 mg four times a day, Vicodin one to two tablets every 4 hours for severe pain, and ibuprofen 600 mg one table four times a day for 3 days.

a. List three possible causes for Edwin’s problems. Explain your rationale.

b. List four questions, examinations, or laboratory tests you would perform to confirm the diagnosis. Explain your rationale.