Not vertigo-related, but I'm pretty squeamish and tried getting into God of War by playing the God of War 3 demo, it was going fine until you ride a cyclops to pilot it as a weapon, and then rip out its eye during a QTE. I took a break for a bit and carried on until the section where you rip Hermes' head off with your bare hands, and they made a point to show the skin tearing while you're tearing his head off. I haven't played a God of War game since, I enjoyed the combat and gameplay but the brutal and over-the-top graphic violence put me off.
Also I'm a complete coward, I played Alien Isolation and it took me over an hour to finish the tutorial. The tutorial has no hazards or anything and is probably 10 minutes long if you're not a massive pussy, but every time I heard a noise I ran and hid (and weeped inside). The xenomorph doesn't appear until you dock with the ship and get on-board. One of my friends is a right dickhead, he knows I hate horror games and bought me Resident Evil 7 for Christmas and I'm so much of a wimp it's still in its cellophane wrap, lol.