A 20 year-old-man presents to the primary care clinic with abdominal pain, nausea, and vomiting for 7 days as well as right-sided headache, photophobia, phonophobia, and back pain. The patient reports subjective fever starting 2 days ago along with chills, runny nose, and intermitting blood in the mucous when he blows his nose. He notes mild lightheadedness and says he is dehydrated because he is unable to tolerate liquid or solids. He denies diarrhea or constipation. He tried over-the-counter cold and flu medications containing acetaminophen, dextromethorphan, and phenylephrine with no symptom relief. He denies recent travel or known contacts with anyone who was ill, is not currently taking any daily medications, and has no known drug allergies or history of abdominal surgeries. Physical Examination The patient's vital signs are stable. On physical examination, the patient shows tenderness to both light and deep touch at that left-lower quadrant and...