Is it normal to get a bit dizzy from a few sips?

I was drinking a 5% cooler, and after a few sips I got a bit dizzy. Now I’m no stranger to drinking and having a good time but a year ago I got two concussions and have lightly bumped my head since.

I’ve quit drinking for that duration and now I’m a total lightweight. Is it supposed to affect me this much or is there still some healing I need to focus on?