It's a subject I know a bit about. Rotten luck, whatever the cause. You'll probably find, if it's Ménière's related, that the problem is in the inner ear. The three loops coming out of the cochlea surprisingly have an inner-tube which carries a different fluid. Leakage from one tube to the other is seriously disruptive to the information being sent to the brain. Pressure in the cochlea is an issue, and it's surprising that it's no easy task to bleed that pressure off.
Have you any loss of hearing? Is it becoming evident that one side is being affected more than the other?
I'm not qualified to judge if it's Ménière's or 'just' a virus, but it does sound like an infection that may clear up. The long gap between the early episode and now does sound a bit virus-like; something that can lie hidden and inert for years.
When you're better from this era, make plans for a vigorous response to any further attack. Have your doctor's office/surgery very aware of the need for an aggressive and immediate course of antibiotics (if there's a chance it's bacteriological) , or steroids, or whatever a specialist deems appropriate.
I'm aware of one case where the patient must not have any salt. Travelling for him means careful planning of accommodation where he can rely on the staff, it is that critical. But that is Ménière's.