VR sickness is very common, and should be addressed by the user immediately upon feeling it. Ginger or anti-nausea medication can mitigate VR Sickness. Anytime motion sickness is felt, it’s best to hop out of Virtual Reality as soon as possible and wait until a full recovery is made.
VR Sickness varies greatly from person-to-person and some people may never even feel sick in the first place.
Do you have SteamVR Base Stations 1.0 or 2.0?