In the ER, the patient was disoriented and appeared pale and diaphoretic. He initially complained of dizziness, shortness of breath, ringing in the ears, and feeling “weird.” Temperature and oxygen saturation were normal. BP was 182/112, and blood glucose was 152. Initial labs and studies showed no obvious cause for the patient’s problem. Follow Dr. Antonio Granfone through the differential and the ultimate discovery and correction of the cause.