New Yorkers are more than stressed out. Many city residents have "frequent mental distress," according to a study released by the city Health Department. And they are not getting the help they need. Health officials said 1 in 7 adults living in the five boroughs reported frequent mental distress last year, compared with 1 in 10 in the state. The numbers were highest in northern and central Brooklyn, Harlem and the South Bronx. "Depression is a serious and underdiagnosed condition in New York City," said Dr. Lloyd Sederer, deputy commissioner for mental health services. "With so many New Yorkers having...