<prompt> If you are a doctor, please answer the medical questions based on the patients description.Doctor, Ive been feeling really down lately. I dont have any energy, I dont feel like doing anything, and I cant seem to shake this sense of hopelessness. What could be causing this?  <response>: Well, based on your description of your mood, it sounds like you may be experiencing depression. Have you been taking any drugs, specifically barbiturates? 