I agree with fhg on all but one point. I think whatever damage you've done on your vacation will have a lot to do with how strict you were with your diet and training beforehand. I think if you were really strict beforehand, I don't see it taking four weeks to get back for every week off. That seems excessive to me.
Most experienced lifters will recommend a week off after 2-4months. This will give your body a chance to recover and is generally a good thing. But don't get me wrong, no one will recommend 12 days off while on an eating binge either, but you might not have done as much damage as you think.
When I have taken weeks off in the past, but still sticking to the diet, I've come back and was actually stronger than when I stopped. So it's different with different people.
Either way, you need to take this guy's advice. Get back on the diet and to the gym as soon as possible. The fun is over man, back to work with you!