A 28-year-old woman presents with an 18-hour history of severe epigastric pain and vomiting. She has a history of multiple small gallstones. Labs: WBC 13.4 x 10^9/L, Alkaline phosphatase 289 IU/L, Amylase 488 IU/L, Direct bilirubin 19 μmol/L, Total bilirubin 34 μmol/L. Which of the following is the most appropriate initial management?
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