Episodes of sudden-onset vertigo with nausea/vomiting
Duration: usually 2-8hr
Frequency: Ranges from several episodes per week to several times per month
Roaring tinnitus
Diminished hearing
Fullness in affected ear
Between attacks patient is well (although decreased hearing may persist)
Duration: usually 2-8hr
Frequency: Ranges from several episodes per week to several times per month
Ménière's disease
Vestibular/otologic
Wellens' syndrome
Benign paroxysmal positional vertigo 
Benign paroxysmal positional vertigo
Traumatic 
Sheehan's syndrome
Infection