Rose, vertigo can have a number of causes. Sometimes there are mechanical impediments in the inner ear, but vascular anomalies are also possible (those of the brain are definitely worth knowing about; come to think about it, vasculitis anywhere is worth knowing about). The latter is presumably why the MRI is in order. The intermittent aspects in your case suggest this is worth looking into. Still, one rap on Wegener's is its association with things like ear blockages. I would say that this possibility shouldn't be ruled out. Vertigo may be mild, fleeting, and not easily explainable. Yet it may also be revelatory and important. Keep on top of it!
Al
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