The day after a binge

3500 calories per month over maintenance mathematically leads to a gain of 12 lbs per year. It would be very easy to eat 3500 calories extra in 1 or 2 binges a month. If you find yourself gaining over a period of several months, then adjust your daily maintenance calories down by 100-200 per day to compensate for the bingeing. Depending on your gain and frequency of bingeing, that number might need to be a little higher or lower.

I had a higher than usual day yesterday, not binge worthy, but over 500 calories in the red. So today, I'll exercise more and harder and forget about yesterday!

How many calories do you usually go over when this happens?

If I eat much higher calories than normal, I notice that my appetite naturally decreases the next day or two, so it's as if my body resets itself. Naturally, I make up for it if I listen to my body, without calculating intentionally.

Just get up and resume you're normal program. I'd recommend counseling as well.
I eat based upon my Macro targets vs. calorie target. This means if it fits my %, I can eat it and still maintain/lose weight. Also my body is getting exactly what it needs so I have no cravings and I'm never hungry. Maybe look into that as an alternative?

The more I tried to restrict my calories to make up for a binge, the more likely I would be to binge. I know it sounds kind of obvious but I'll say it anyway: instead of crying over spilt milk, it is better to address the issues that lead to bingeing in the first place.

When I used to binge, I'd grab the nearest edible thing as fast as possible and devour it before my mind could get a chance to tell me to stop, and I would end up eating 3000-4000 calories per sitting. Once I joined MFP, I controlled the binges by gradually increasing my deficit as opposed to eating at a 500-calorie deficit from day 1 - started at maintenance, began eating at a 100-cal deficit after a few days, increased that to 200 cals the next week, and so on. I kept only low-calorie snacks in the house. I learnt to recognise emotional triggers that would lead to a binge and distracted myself the best I could by hopping into the shower, brushing my teeth, going for a walk, calling a friend etc. This would give me enough time to get back some semblance of control. Once the "danger" had passed, I would try and work through the emotional problems that made me want to binge, although a better alternative would have been to speak to a counsellor.

These things worked for me personally, and thought I would give my two cents if it helps anyone. Good luck OP.

After a serious binge, like Thanksgiving I def restrict.
For more minor ones I just get back on track. Also I keep my baseline calories lower than recommended since a) binging is inevitable and b) we tend to underestimate our caloric intake. That way I'm back where I need to be (maintenance) in a day or so.