You acclimatise to it. It's like with seasickness, the vast majority of folks will, over time, train their brain to subconsciously recognise a situation where the inputs of the eyes and the balance centres need to be decoupled and treated as separate data streams not as a unified whole. On a boat it's worse down below because you're surrounded by a visual field that's moving with you and you can't see any reference point that will bring your visual input back into sync with what your balance is telling you. Ideally to stave off seasickness you get on deck and watch the horizon. That's the "boat" equivalent of taking a break from VR, but it's not as effective so at sea you usually end up puking a few times before you get your sea-legs. VR, taking off the headset instantly brings things back into sync.
There are two schools of thought for hurrying the acclimatisation process at sea and it's impossible to predict which one will work best for who except by experience. Some folks find shorter periods of more intense exposure (on a boat thats staying below as long as you can before you HAVE to go up on deck) work best. Others swear by longer periods of a milder "disconnect" between the two senses (you stay on deck and limit your time below as much as you can).
You'll find something similar in adapting to VR - one or the other will work for you to get you used to it most quickly. In ED-VR, for the strong exposure you're looking at something like dogfighting in an agile ship with lots of FA-off maneuvers. You will not be able to tolerate this for long at first. For the milder exposure, fly a more sedate ship doing something that still requires you to maneuver, just not as violently as in combat. Maybe threading your way through a ring system doing some mining or something. You will be able to tolerate this longer than the dogfighting situation.
Either way, however, Don't push it. When you feel you are approaching your limits, stop before you reach them and take at least 3x as long outside VR as you were able to tolerate in it before putting your headset back on. At sea, there's a lee rail to puke over. In your play space there's lots of tasty and expensive electronics that don't like getting yakked on (otherwise known as "gettting sprayed with stinking acid"). Plus, if you can smell puke, it takes very little stimulus to make you add to it and your play-space probably has a lot more absorbent surfaces that are more difficult to properly deodorise than the deck of a boat that's being sluiced down with salt water.
You'll get there, and preferably without a malodourous play-space.
