I’m not a drinker but .y brother bet me $20 I couldn’t finish his whiskey in one go and I did and not my head is fuzzy what to do???

I don’t usually drink acholoh, it taste gross and it sucks but I just got home from work and my brother pulled out his whiskey complain about how I drank all the Pepsi, and I saw the bottle and he only had a lil left. So I said, that only a sip, and he bet me 20 I couldn’t drink it in one go and I did and now I feel horrible. My head feels dizzy and my eyes are going crazy. Like I just spin in circle for 2 hours. I ate some bread and drnak some water. What else can I do to feel better??? Mac anchesee