Every single time I drink alcohol I'm sick?

Basically every time I go out and drink I'm sick what could be reason for this? I'm sick threw whole night and I can't get up till late next day I usually only drink vodka. Could it be possible I'm allergic to alcohol , maybe it just doesn't agree with me or could it be what I am drinking? Does anyone else have this problem?
Every single time I drink alcohol I'm sick?
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