many people get motion sickness before the brain adapts (in ~1-2 weeks of gradual regular use) and psvr games run at lowish frame rates which make it significantly worse. some games are worse than others (e.g. I rarely get sick now but a game called Maskmaker made me feel sick recently)This was my exact experience with the PSVR. Couldn’t play it for more than 15 minutes without feeling sick.
obviously not good for adoption but most people should get over it with exposure