Paroxysmal atrial tachycardia may be caused by several different things. The fast rate may be triggered by a premature atrial beat that sends an impulse along an abnormal electrical path to the ventricles. Other causes stem from anxiety, stimulants, overactive thyroid, and in some women, the onset of menstruation.
Sudden hearing loss is associated with vertigo in between 20 to 60% of patients (Rambold et al, 2005). The wide spread probably depends on what you define as vertigo -- a little bit of dizziness, or a profound sensation of rotation. Patients with vertigo also usually have worse hearing (Niu et al, 2015).
An example of dizziness induced by inner ear pressure changes might be dizziness associated with the Valsalva maneuver. This is a straining maneuver that increases pressure in the spinal fluid and inner ear perilymph space. Superior canal dehiscence is the main cause of Valsalva induced dizziness. An example of dizziness induced by middle ear pressure fluctuation is alternobaric vertigo -- such as occurs in people who can clear one ear, but not the other.(Tjernstrom 1974; Tjernstrom 1974; Tjernstrom 1974; Klingmann, Knauth et al.