A 48-year-old white man presents with unremitting right flank pain. He denies dysuria or fever. He does report significant nausea without vomiting. He has never experienced anything like this before. What is the probable diagnosis? What are other possible diagnoses? At this stage of the case study, what diagnostic studies and basic treatments are most appropriate to order and why?

 A 48-year-old white man presents with unremitting right flank pain. He denies dysuria or fever. He does report significant nausea without vomiting. He has never experienced anything like this before. What is the probable diagnosis? What are other possible diagnoses? At this stage of the case study, what diagnostic studies and basic treatments are most appropriate to order and why?