Kristen is a 38-year-old divorced mother of two teenagers. She has a successful, high-paying career in upper-level management. She has worked for the same thriving company for six years; however, over the past eight months she has found herself worrying constantly about losing her job and being unable to provide for her children. Kristen has been feeling restless, tired, and tense. When she goes to bed at night, it's as if her brain won't shut off. She finds herself mentally rehearsing all the worse-case scenarios regarding losing her job, including ending up homeless. Which disorder could she have?