K. Waheed of Virginia started having flashbacks when she was in her twenties. Her “persistent, terrifying” images and memories didn’t always make sense, but afraid that they would harm or even kill her, she checked herself into a psychiatric hospital. That’s where she was diagnosed with posttraumatic stress disorder, commonly referred to as PTSD. K’s diagnosis came years after a series of events scarred her childhood, including physical, sexual, emotional, and spiritual abuse and...

