A 45-year-old male presents to the emergency department complaining of severe right flank pain radiating to the groin, accompanied by nausea but no vomiting. On examination, the patient appears restless and reports pain exacerbation during movement. Which of the following is the BEST initial management for this patient suspected of having renal calculi?
Schedule for outpatient ultrasound
Administer intravenous fluids
Immediate surgical consultation
Prescribe oral analgesics