I've had vertigo for over 30 years, although it rarely flares up anymore. Mainly when my sinuses are congested or the atmospheric pressure is high, or it's windy.
I've been told it's all in my imagination, that it's meniere's, that I need the Epley maneuver (I don't).
Finally a few years ago I got sent to a topnotch neurologist who had me undergo all sorts of scans and tests, including one where they put a stream of warm water in my affected ear. I got so dizzy from the water test that I was clinging to the table and yelling for them to stop because it felt like the exam table was rocking wildly back and forth..
The diagnosis: I have nerve damage to my inner ear - vestibular neuropathy. There's not much that can be done about it, but at least I finally know what is causing it. I don't drink alcohol, limit myself to 2 cups of tea a day, no coffee. When my tree pollen season starts in January I use Flonase and an oral inhaler for my asthma until late April. When it's cold and windy I try to stay indoors.
Ginger tea helps a little.
Good luck to you in finding out what's causing it, and finding a way to treat it. 
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