It's surprising how different people can be affected by disorienting camera techniques and flashing presentation. As children, most tend to be quite relaxed about visual anomalies, but not so much as you get older. I don't generally have problems with shake effects or with flashing/blinking ( other than they are almost always overblown and not necessarily helpful ), but I find first-person cameras that emulate tracking your head movement as you climb over obstacles really disconcerting to the point of feeling ill.
My main thing is motion-sickness, which I would also get really horribly as a child. Perhaps surprising given my driving which is... well, not relaxed, let's say. Flashing sets off my migraines too, which I try to convince myself I don't have as there're no anti-migraine drugs I've tried that I find agreeable, which seems like an older age thing but a lot of stuff either starts or stops being a thing as one's hormone levels change over the course of one's life. The motion-sickness may also be migraine-related anyway as I get the type where my awareness of perspective goes all wonky.
