I reckon it's the number one skill for long term weight maintenance to accept that these things happen and react appropriately/proportionately. Stop and ask yourself "Am I trying to punish myself or am I trying to put this right?" - quite different strategies!
First of all, assess the damage. I'm not sure whether you're saying you overate by 6000 kcal, or that you ate 6000 kcal over the weekend. If the former, that, very roughly, equates to about 2lbs of body weight, if the latter, knock off a planned allowance of approx half the total, and you've got about 1lb of body weight. That's above what you might have planned for the week, so say you're set for 2lbs loss per week, and you revert to plan today, you might stay the same or lose a pound. If you're set for 1lb loss per week, you might gain a pound or stay the same. Of course, we don't often lose like clockwork, but it should average out over a few weeks. The point to remember is that's what you've earned.
If you've overdone food, especially carbs, especially sugary ones, and ESPECIALLY booze, then your blood sugar will be all over the place for the next few days. For god's sake, don't make it worse by fasting or overexercising! All that's doing is lining up another binge to go with the first. Instead, get back on your usual eating plan, but with extra care to stabilising your blood sugar: plenty of fibre and protein, little and often, no sugary or processed carbs. Extremes only breed extremes... Your aim should be to bring it back, as quickly as possible, to the stable centre.
Finally, look back at what went wrong. Are there any lessons to learn? Situations and behaviours to try and change for next time? What were the thought processes that led you to overeat (and yes, there were thought processes behind it... Feeding yourself may be a well-practiced habit, but it is NOT a reflex). Take the lessons, then put the whole episode behind you.