drank alcohol for the first time and now my stomach is messed up

have no idea this is normal, my friends have told me it’s a stomach hangover and i would’ve believed them if it had gone away after the first day but i’m on day three and my stomach is in knots, like i feel like i have the stomach bug, just without the painful cramps. i can still eat food, but i have to be careful with what i eat or else it’ll send my stomach into a queasy mess. just want to know if this has happened to anyone and if it had, what can i do because this is annoying me to no end