Stomach hurts every night since a drink ?

So last weekend (5 days ago) I had a weird absent vodka drink mix and it Renee green. That's the last time I'm drinking a mix drink that I don't make myself. I only ad 3 sips but it was enough to make me throw up that night. And I know it was that drink cuz besides that I only had 2 beers. But I felt a lot better after I threw up but now every since that day, my stomach feels sick. Not enough to throw up again but enough to where it's uncomfortable.(mostly at night) any of the counter pills I can take? Would Alka seltzer help?