A 32-year-old woman presents to your clinic with an 8-month history of persistent worry and tension. She reports excessive concerns about her performance at work, her children’s safety, and her health. She finds herself unable to control her worrying, which occurs more days than not. She also experiences difficulty concentrating, irritability, muscle tension, and trouble falling asleep. Physical examination and basic laboratory tests, including thyroid function tests and ECG, are unremarkable. She has no history of substance use or major psychiatric disorders. Which of the following is the most appropriate next step in management?