[In] Miram Shah, the frontier Pakistani town that has become a virtual test laboratory for drone warfare, ... residents paint a portrait of extended terror and strain within a tribal society caught between vicious militants and the American drones hunting them. Their claims of distress are now being backed by a new Amnesty International investigation that found, among other points, that at least 19 civilians in the surrounding area of North Waziristan had been killed in just two of the drone attacks since January 2012 - a time when the Obama administration has held that strikes have been increasingly accurate and free of mistakes. Miram Shah ... has become a fearful and paranoid town, dealt at least 13 drone strikes since 2008 - more than any other urban settlement in the world. Even when the missiles do not strike, buzzing drones hover day and night, scanning the alleys and markets with roving high-resolution cameras. The strikes in the area mostly occur in densely populated neighborhoods. The drones have hit a bakery, a disused girls' school and a money changers' market, residents say. The constant presence of circling drones - and accompanying tension over when, or whom, they will strike - is a crushing psychological burden for many residents. Sales of sleeping tablets, antidepressants and medicine to treat anxiety have soared, said Hajji Gulab Jan Dawar, a pharmacist in the town bazaar. Women were particularly troubled, he said, but men also experienced problems. State services have virtually collapsed. At the local hospital, corrupt officials are reselling supplies of medicine and fuel in the town market, doctors said.