In 1996, a medical student at the University of Maryland was assigned a case for a seminar on "underdetermined diagnosis in difficult cases." His patient was a gentleman who lived in the mid-1800s and was a well-known poet and animal lover. The man was taken to a hospital with delirium and tremors. He was confused, combative, and he refused to drink any water or any liquid. He lived on Oct. 7th, 1849. When told the man's name, the student thought "Nevermore!" What was his diagnosis?