I also wondered if an AN qualified as a "vestibular disorder". If you google that phrase you will find a list of disorders and there is acoustic neuroma. This is what I found:
Vestibular (inner ear) disorders can cause dizziness, vertigo, imbalance, hearing changes, nausea, fatigue, anxiety, difficulty concentrating, and other symptoms, with potentially devastating effects on a person's day-to-day functioning, ability to work, relationships with family and friends, and quality of life.
Diagnosing and treating vestibular disorders is not always straightforward. In addition, such disorders are often "invisible," making it difficult for others to understand how disabling they can be.
Specific Vestibular Disorders
Benign Paroxysmal Positional Vertigo (BPPV)
Meniere's Disease
Secondary Endolymphatic Hydrops
Labyrinthitis & Vestibular Neuritis
Perilymph Fistula
Acoustic Neuroma
Ototoxicity
Vestibular Migraine
Mal de Debarquement
Pediatric Vestibular Disorders
Aging, Dizziness, & Balance
Cervicogenic Dizziness
Otosclerosis
Cholesteatoma
Enlarged Vestibular Aqueduct
Vestibular Hyperacusis
Autoimmune Inner Ear Disease
Superior Canal Dehiscence
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So, there we are!
Sue in Vancouver