Be careful... everytime you drink you risk the chance of bad things happening and falling deeper into that cycle. At this point you havnt hit a very low low bottom (I never really did either) but is that where you want to go? Some people need to hit the rock bottom before they are ready to quit. I chose to save myself before something drastic and terrible really happened. Its up to you to make the decision to quit when you are ready. Let us know how your vacation went!
Dont you think you will have more fun experiencing your vacation with a clear sober mind? Life is actually really fun when you get that monkey (booze or drugs) off your back.
Have a great time regardless!