I've never felt more sick than after trying the VR for the first time. GearVR on Samsung Galaxy S6. Never happened again though, regardless of how much time I spent in.
The main issue on this headset was that I felt like my head was really small, while turning. I think the camera was just rotating on it's own axis, or around a sphere that was way smaller than a human head.
There is a huge difference between gearvr and any sensible VR like the Vive, Pimax or Index. I've tried both. Gear made me almost barf immediately. I'm playing Project Wingman with no issue on the other headsets. There is a huge technological difference.