Hungover so easily

Bruh I’m 26 i used to be able to party for days,now I have around 4 beers after a week of work and I’m sick as a dog,migraine that makes me nauseous.look like a bus hit me and I’ll be in and out of the bathroom/shower most of the morning I’ve tried all sorts of different avenues like trying spirits,different beers,wine,nothing does it.ill smash a Panadol and water before I go to bed and still be on the verge,but In saying that new years i drunk endless amounts for about 3 days not a single sign of a hangover,is my liver and kidneys cooked from all the abuse over the last decade or is this just part of growing up and realising alcohol is actually just flavoured poison