A 50-year-old male complains of vertigo accompanied by unilateral hearing loss and tinnitus. The vertigo episodes last for hours and are not related to any specific head movement. What is your primary diagnosis and how would you investigate further?
This patient's symptoms suggest Ménière's disease, which is characterized by episodic vertigo, tinnitus, and sensorineural hearing loss. An audiogram should be performed to confirm the presence of sensorineural hearing loss. Other investigations, such as vestibular testing and MRI, may be needed to exclude other causes.