Can anyone elaborate on the difference between being allergic to beer and alcohol, versus just there normal negative effects?

I feel like some beers just have such a terrible negative affect on me, that profoundly surpasses what most people meany when they dicuss the negative effects.

Whenever I try and look into it, I just see the standard "top ten hangover symptoms" or whatever.

It's increasingly hard to find useful information on the Internet.

Is there a difference? Or are we all allergic to alcohol and just the symptoms vary?