Why are hangovers so random?

like.. Sometimes I’ll have 5 drinks in an evening and feel like shit the next day

on the otherhand, last night for example, I’ve had about 8 drinks and also smashed lines of ket with my friend through the night (it makes one drink feel like 3). When going to bed i was so fucked up i could barely walk. I wasn’t exactly capable of feeling anxious in that state but i was still like “oh imma be fighting for my life tomorrow”

well i woke completely fine. I’m talking like not even a slight headache or anxiety, anything. it’s 6pm rn and i went about my day as usual

i don’t understand my body