weird hangover ?

So I never normally get hangovers but last night I was personally victimised by sambuca & ive got the worst hangover I've ever had. I keep being sick but it's not actually sick ? it's like a hell of a lot of flem and water but it's making me feel dreadfully ill , I didn't really eat a lot yesterday before we was drinking but this type of sick is horrid it makes me be sick but it's not sick 😫is this normal or Have I had something weird