Warning, the game has a fair bit of ship simulation where you are out on the water in waves. Dunno if that bothers you too. Flashing, I don't know about that, I don't know of any. Shaking, trees shake when you hit them, but with it turned off, not so bad generally.
try your 2 hours to refund to see if you can tolerate it, see if you can get a buddy to take you out in a boat or something...