Seriously, though, Balance ... I have thought about your problem and this is what I came up with as an Aviator "mind-meld". It worked for one man (me) in any/all situations when I was not physically in control of the aircraft. It was not a "conscious" evolution on my part -- it just kind of happened, luckily for moi ...
"Fly" the maneuver, engagement, scenario, whatever, wherever you are in the sky ... and this may not make complete, total sense in print --- but if you are mentally "going through the maneuver" -- even subliminially -- you will take your physical "feelings" out of the equation. I am not kidding.
If you have a stick in your half of the aircraft -- put your hand on it and (lightly) follow-through. Tell the instructor or pilot in advance what you are doing so they will not be suprised with the slight "bump" or "pressure" that this might engender. If you don't have a stick -- "think" your way through the maneuver, either talking to the pilot-o or "talking" to yourself. I think this is why pilots puke less than the rest of the crowd. We have to "think" the flying evolution/maneuver -- even when it becomes "automatic"; whereas the rest of the group are dwelling on the forces impacting their bodies -- instead of focusing on the flying.
This WILL WORK -- I guarantee it. It will all depend on you ...
Or Join The Pukin' Dogs ...