Hello~You are probably going to be OK, but if you get some different or new symptoms, then see a GP to make sure all is well.
This was last night? How many hours ago? And when you say 40% vodka, that's what vodka usually is. HOW much did you drink is the biggest question. A sip? A shot glass full? A bottle? You say large amount, what is that? And were you wasted drunk? I think the best way to counter stomach issues from alcohol is to not drink alcohol. I doubt you did permanent damage with a once go round with hard liquor but don't make it a habit.