It happens! I’ve been in a similar situation. It’s definitely not the same, but maybe cut down your normal daily calories tomorrow by 400 to compensate a bit for it? When I’ve gone a bit over, that’s what I’ve done and it’s seemed to work for weight. Not ideal, but definitely better than just ignoring the fact you’ve gone over.

I’ve written myself a sign which says “Do NOT eat at night” – apparently eating at night contributes to the development of cancers and diabetes type 2… I’ve managed to ignore it about 3 times over 3 weeks, but I am finding that by having it in a prominent place it is helping a bit.
I refuse to calorie count – I know what is smart to eat and what is smart to avoid – and I mostly stick more or less to about the right amount on fast days, but sometimes it is SO hard.
I am a total sugar-holic; I’m trying various things to try to alter that (emotional freedom technique, not buying any) but I am very good at finding substitutes when desperate, even if the shops aren’t open!
Drinking a hot drink seems to help reduce the urge a bit.
Otherwise, I’m just hanging in there and hoping it will be easier to stay with it as time passes and I’m more used to it.
Good luck!