Human beings, being human, get anxious. We all do, except psychopaths. An estimated 40 million Americans suffer from anxiety of some form at any given time. Some of us get really, really anxious, like Scott Stossel, a writer and editor at the Atlantic whose memoir of a lifelong and often paralyzing struggle with the condition is about to be published. For those of us to whom anxiety is a more occasional visitor, the condition can be crippling.