i play alot of games like cs2, l4d, valorant and other shooters but i have never felt getting so drained or nauseous after playing a game before. maybe its because of the puzzles around it? idk im not sure but there are mini puzzles in l4d too but it didnt even bother me (tbf there are prompts so its easier as hl2) im not saying hl2 is hard, just saying there are times you get brainlag and dont realize you just have to do that certain task lmao i just feel like my tummy hurls a lil bit and my head aches a little, just discomfort per se

edit: 100 FOV helped me out motion blur disabled (though it was disabled by default) still makes me a little nauseous but atleast its not that bad unlike before.