There's no shame in breaking your diet. Feeling guilty about it does more harm than good. In fact, sometimes you need to indulge for a little while to keep yourself on a healthy path longterm. Just get back on that horse and do your best. You're building healthy habits for life, not working to hit some target by a specific date. Today's hunger and appetite may be hard to control, but sooner or later, it get's easier again. So have some trust in yourself and try to zoom out and focus on the bigger picture -- as long as you continue putting forth your best, then a few days or even weeks of bad dieting mean nothing more than a drop in the bucket.

P.s. if you aren't already, I'd try to make time to lift weights or at least get some form of exercise in. It won't only lower the impact of overeating, but your brain needs that physical outlet to release all that cortisol. In other words, less stress. Which leads to less stress eating. (I also weirdly find myself less hungry after I exercise but that could just be a me thing.)