Anxiety/psychology; Cognition; Dizziness/psychology; Meniere Disease/psychology; Meniere Disease/therapy; Vertigo/psychology; Adaptation, Psychological; Adult; Aged; Aged, 80 and over; Analysis of Variance; Anxiety/diagnosis; Anxiety/therapy; Culture; Dizziness/physiopathology; Dizziness/therapy; Fear/psychology; Female; Follow-Up Studies; Humans; Longitudinal Studies; Male; Meniere Disease/physiopathology; Middle Aged; Pamphlets; Relaxation Therapy/methods; Severity of Illness Index; Surveys and Questionnaires; Treatment Outcome; Uncertainty; Vertigo/physiopathology; Vertigo/therapy