why am i still nauseous two days after drinking, but unable to throw up?

TLDR: Drank a lot two nights ago. Still slightly nauseous all the time, but nothing comes out when i try to vomit. Please advise, and has anyone else experienced this?

context: i’m 24, i was at a farewell party and got very very drunk. didn’t feel sick that night itself and went to bed normally, but for two days now i’ve been feeling ever so slightly nauseous all the time. i thought i’d get it over with last night and tried to make myself throw up, but i just dry heaved and nothing more. felt fine after that but it’s coming back the next day.

also might be important to mention: it was still manageable up until yesterday evening when i did some ab exercises at the gym. i think the pressure on my stomach made it significantly worse :/ i was feeling pretty okay before that, and wouldn’t have touched the exercise if i knew this would happen.. now i know better

what do you suggest i do? i’m staying hydrated, getting good sleep, and having simple food. this has never happened before. i drink quite rarely.