Dani and Sona have been married for five years, and lately Dani has noticed changes in Sona’s behavior. Sona says she is constantly tired, and lacks the energy to shower and groom herself on a daily basis. She hasn’t changed clothes in days, has lost her appetite, and is losing weight. She hasn’t been bicycling in weeks, though she used to do so every day. What best describes what Sona is experiencing?