What does it mean to have a meniere's disease episode?

Meniere's: Meniere's is a disorder of the inner ear that can affect hearing and balance to a varying degree. It is characterized by episodes of vertigo low pitched tinnitus and hearing loss.

Vertigo: Patients with menderes disease have recurrent episodes of vertigo, typically lasting 20 minutes to 8 hours, as well as tinnitus, hearing loss and a pressure sensation in the affected ear. All these symptoms may fluctuate or be more sever with the episodes of dizziness.