Diplopia and nystagmus present in patient with complex neuropsychiatric history

A 45-year-old woman was admitted to the neurology service at Lahey Hospital and Medical Center with symptoms of double vision, gait disturbance secondary to lower extremity weakness and subjective memory loss.
Her medical history was significant for alcohol use disorder, a recent fall with head strike while intoxicated and withdrawal seizures, for which she required a 2-day hospital admission 6 weeks before this hospitalization. Her medical conditions also included bipolar disorder, anxiety, depression, polysubstance use, asthma and other unspecified seizure disorder. Home medications included