A 40 years old presents with left-sided facial paralysis, which began as left ear and facial pain a day earlier. She reports slight numbness and loss of taste on the left side of her tongue and finds her hearing in her left ear to be unusually sensitive. She has difficulty keeping liquids in her mouth, smiling, or closing her eyes. On physical exam, the left nasolabial fold is absent, and the left corner of her mouth droops. On the left side, she cannot voluntarily raise her eyebrow, close her eyelid, elevate her mouth into a smile, snarl, or pucker her lips. The rest of the history and physical exam are normal. What is the most likely diagnosis?