My flyng buddy, Gil Reedy, got hit by Meniere's disease about 1995. It is a virus infection of the inner ear. He woke up from a nap one day with the room spinning around. Took him all afternoon to get out of bed and get to a phone. The treatment was limited to cortisone for the swelling/fluid and Dramamine etc. He didn't fly for about 6 months. Had to quit flying full scale for about a year until the doc cleared him.
After a year he was back to flying both model and full scale with no particular problems. I think he had one semi-serious relapse a few years later. But he flew both stunt and combat up until about 18 months before he died.
There is such a thing as "vestibular training". About half the air combat pilots get vertigo a times when they do air combat maneuvering. They practice hard to work through it and keep flying successfully. Making yourself dizzy and learning to keep your orientation by eyeball can help a lot. If you don't have Meniere's it can be helpful. One simple excercise- stand in the middle of the room, or over soft grass in case you do fall over. Hold your hands straight up over your head. Look straight up and turn around a couple of times and then turn the other way. It helps to have something directly overhead to focus on. Do the exercise regularly, increasing the number of turns and the speed, focussing on paying attention to the focus point and what your body, feet especially, try to do by reflex.
Another good one is to take off, turn upside down, and fly the tank out. Then try doing short climbs and dives, both upside down and right side up. Finally, work up to flying the pattern upside down. Unless you really have Meniere's or some other problem, most people can get dizziness under control in a few practice sessions.
The other thing is medicines. Almost everything I take seems to list dizziness as a side effect. Beta blockers, propanolol, some cholesterol meds, diazepam, anti-spasmodics most of the anti-anxiety meds, anti-depressants, etc. Check with your doctor what ones are really necessary or what can be substituted for them. I was taking propanolol for awhile. I found myself simply flying into the ground because it interfered with reflexes so much. I dropped it when I figured out that I didn't really need it most of the time and the problem went away.
Have fun!
Phil C