A 28-year-old man is evaluated for a 10-month history of dizziness. He describes the dizziness as a sense of nonvertiginous imbalance and notes that it worsens with personal motion, movement of objects around him, and sitting or standing upright. The dizziness has persisted since he experienced a concussion without loss of consciousness while playing soccer 10 months ago. He reports no focal neurologic symptoms. He takes no medications. On physical examination, vital signs are normal. On neurologic examination, cranial nerve examination findings are normal, motor strength is intact, and deep tendon reflexes are normal. Romberg test result is negative. Gait is normal. Findings on a brain MRI are normal. In addition to vestibular and balance rehabilitation therapy, which of the following is the most appropriate treatment?
Amitriptyline
Canalith repositioning maneuver (Epley maneuver)
Lorazepam
Sertraline