I have been using Macs for last 20 yrs with no issues at all, and currently have a 2019 Pro that still has Catalina on it that I work on every day with zero issues and I have a 2018 air that I have used for last 3 years with no issue, always on Catalina. I recently upgraded that one to Montery and instantly, I can't even look at the screen anymore. After looking at it for even minute I get nausea and vertigo and this lasts for at least 24 hours after that. Ive tried Ventura, same thing. Ive tried a brand new 2020 Mac same thing. Desperate because I don't know how I'm going to be able to continue to work. Its not the hardware because the same computer that I used for 3 years instantly change with the update, it has to be the software. Also, using an external monitor doesn't help.. whatever this issue is, goes through to the monitor somehow. Does anyone know what in the world this could be?