mrcem2-0424

A 65 year old male comes to the emergency department with a 24 hour history of increasing dizziness. The patient reports feeling a sensation of spinning upon waking up this morning, and it has progressively worsened throughout the day. The patient mentions that head movements exacerbate the symptoms, but even when remaining still, the spinning sensation persists. There are no complaints of hearing loss, ringing in the ears, changes in vision, or focal neurological abnormalities.

What is the most probable diagnosis?