That's likely the flight simulator application causing it, not the VR headset. Those things are extremely performance intensive even without VR, with VR it gets

That's likely the flight simulator application causing it, not the VR headset. Those things are extremely performance intensive even without VR, with VR it gets only that much worse. Unless the application & the setup is very high end and extremely well tuned, it is going to be a barf fest due to lag, poor frame rate and other issues. Your friend is likely used to it (most people lose the feeling of nausea and motion sickness over time) but for you it was likely too much. Ask your friend to show you some of the basic demos that came with the headset they have. I bet you will have much better time.