Yesterday morning, a doctor jumped to his death from the 17th floor of a Beth Israel Hospital building. The body of 44-year-old Douglas Meyer was found "on an air-conditioning unit between two buildings" by a security guard at 7 a.m. Meyer, called a "'gifted' gastroenterologist and liver specialist," had completed his rounds. A hospital technician told the Post, "We started calling him at 7 a.m., and we couldn't reach him. And then one of the......