As someone else said, try turning up FOV. Last night I decided to try Doom Eternal for the first time. (I played the new Doom but didn't finish it.) The default FOV is 90, and motion blur is on. In a game mostly involving corridors and fast movement, 90 is stupidly low. It's set up for people playing on a TV 6+ feet away, not a comouter monitor much closer. These two settings may be your issue.
That sucks! I don't get any motion sickness, so no personal recommendations, but have you tried some of the common tricks (like increasing FoV, disabling motion blur)?