
Marie lives in the coastal town of Swampscott, in Massachusetts. Last December, she began having more and more trouble breathing. One morning, three days after Christmas, she woke up gasping for air. A voice in her head said, "You're going to die." Marie dialed 911.
"I was so scared," Marie said later. Describing that day, the 63-year-old's voice filled with tension, and her hand clutched at her chest.