Feeling Dizzy And Lack Of Concentration After Drinking Vodka. What Is The Suggestion?

4 days ago I drank rather a lot of vodka, something of which I don't usually drink (although I do drink wine and real ales) and basically I had a hangover, although the hangover was worst two days later where I had vomited a couple of times. I managed to get to work but did not really get the right amount of sleep (very tired) and today i'm still dizzy and feel a lack of concentration. I'm worried I may have slightly damaged my brain. It's now Monday and I drank heavily last Thursday night. I'm female, 37 and of average weight and height.