Today was a bad day..

It might impact some of your effort, so just get back on track and keep going. Also try to figure out why this happened and what you will do differently next time you're in a similar situation..

Today was not exactly a bad day, although it may feel bad. If you didn't have days like today now, how would you learn that bad mood leads to losing focus on your diet and plan for it in the future? Now you know. Plan better next time. Think of several things that may help you to handle a bad mood and test them out next time you're in a bad mood. It may take several tries. Expect to have several instances of overeating because that's normal, and that's how our skills are slowly hammered into shape.

As for undoing the work, not gonna happen. Effort is not just calories, but how much you worked on building the habits and skills that will make a diet successful. Even if you overate so much that you undid every single calorie in your deficit, you are not going to undo the choices and mental exercises you used to limit overeating this past week.

What you could do is try to remember what you had, guesstimate it, and log it. You need to build a habit of logging no matter what, even if you overate, even if you don't know exactly how much you ate or don't remember everything, it's the habit that counts. By logging your food you are declaring to yourself that you are not "off the wagon" because you are still doing something about it despite the bump.

ETA: I'm so sorry for what you had to go through, and I apologize for replying too soon. You need to be kinder to yourself during such times. "Don't care" times happen, and it's okay. Virtual hugs in your direction.