In the past IME when I had some periods of vertigo - depending on the AD medication I was on...
I would purchase OTC motion sickness tablets at Walgreens drug store.
I found good success with Bonine motion sickness tabs -.1 per day.
I would try 1/2 tablet at first - it may cause some drowsiness.
This was very helpful for me....
Also I always have sinus problems - which only adds to this.
Just an idea