Am I allergic to vodka?

So I was at a sleepover with a couple of friends and we got some vodka. We didnt want to spend that much money, so each of us only got a shot-worth of it.

We each had our own regular sized red cups and put in about a shot of vodka, then filled it to the top with cranberry juice and sierra mist. Ive had sierra mist before (although only once b/c i dont drink soda) and ive had cranberry juice a lot, but this was my first time with vodka.

I didnt notice any feeling of being drunk or anything the rest of the night, but the next morning I was completely dizzy when i woul standup or walk around, and my stomach was really aching. I had woken up at around 7:30am to go to a volunteer thing. When I got home around 1:30, I went to bed and fell asleep around 2pm. I did not wake up until 7:30 the next morning (today). I am still feeling extremely dizzy and.. blurry (for lack of a better word). Ive also gotten a bad headache, but that may be from sleeping so much. Could it be the vodka still affecting me as an allergy? I know i wasnt drunk b/c i barely had any of it.

What do you think?