A 66-year-old male with a history of MDD (in remission on escitalopram) presents for routine follow-up. He reports no mood symptoms but mentions he has been feeling unsteady on his feet. He fell once last week. His other medications include lisinopril, metoprolol, and lorazepam 1 mg at bedtime (prescribed by his PCP for insomnia 3 years ago). Which assessment is the PRIORITY?