Review Question - QID 216426

A 33-year-old woman presents to the emergency department with nausea, vomiting, diarrhea, and malaise. She says that she has felt very anxious these past 2 days and has been more irritable, has had trouble focusing, and has felt dizzy. She is asking for a prescription for a benzodiazepine for her symptoms as this has helped her in the past. The patient recently moved to this city 3 days ago after changing jobs. She has a past medical history of depression, anxiety, and suicidal ideation and had her psychiatric conditions managed by a psychiatrist. The patient is now being managed by a naturopathic doctor for her symptoms as she wanted to try a more natural approach, and she has begun taking herbs and supplements instead of her normal medications. Her temperature is 98.0°F (36.7°C), blood pressure is 124/80 mmHg, pulse is 117/min, respirations are 18/min, and oxygen saturation is 98% on room air. Physical exam reveals an anxious woman who is wringing her hands. She asks for a prescription for lorazepam and will follow up with her naturopathic doctor. Which of the following is the most likely etiology of this patient's symptoms?