By Deborah Vankin, Los Angeles Times Your heart is racing, your arms are tingling and your breathing is shallow. You’re having an anxiety attack. And you’re in a public place, to boot. A crowded restaurant, say, or at the office. Not a space where you can comfortably lay on the ground and do some deep breathing exercises to calm yourself. What if there were a pill that would instead induce that kind of calm breathing for you?