A previously healthy 45-year-old man presents with severe lower abdominal pain on the left side, which started 36 hours earlier. He has noticed mild discomfort in this region periodically before but has not sought medical treatment. He reports nausea, anorexia, and vomiting associated with any oral intake. On physical examination, his temperature is 38.5°C and his heart rate is 110 beats per minute. He has abdominal tenderness on the left side without peritoneal signs. How should his case be managed?
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