How far post-op are you?
As Dianne said, there is little reason to be concerned about stomach stretching. It takes months, if not years of significant overeating volume to stretch it out. Practically everyone eats more than they should at times.
There are two important considerations with regard to overeating:
1. Why? What drove you to overeat? Emotions? Hunger? Stress? Boredom? Habit? Enjoyment?
2. How do you treat yourself after you overeat? Do you get down on yourself? Do you "punish" yourself by giving up and eating more or making bad food choices?
You should try to address both things and understand your triggers and learn how to recover after overeating. Forgive yourself and don't dwell on it.
Decide to make good choices moving forward and do the best you can. You'll slip up again sometime. Learn not to get down on yourself about it, but also be willing to dig into why you might make the decision in the first place. Consider professional help to talk through it, if necessary.
99% of the time, the battle with obesity, regardless if surgery is involved or not, is all about the food. Don't focus on the scale, focus on developing a new relationship with food that is positive, healthy, and sustainable for the long term. If you make good choices, good things will happen, regardless of what number is on that scale.
That number on the scale is just a representation of the Earth's gravitation pull on your body. Don't let it define you or your success in this process. I know there is a lot in this process that is centered around the scale and weight loss, but that should be secondary or tertiary to working on your health (mental and physical) and developing proper food choices. Make good choices habitual. It can be difficult for a while, but making good choices over and over can become your norm with some time.
You aren't alone in your struggles and don't feel like you are doing anything wrong or something that other people haven't experienced or gone through. We all have our strengths, weaknesses, and demons to deal with in this process.
Keep the faith, keep moving forward and try to dedicate yourself every day to build those habits so when you do reach your low weight point, you are in a good position to protect it for the long term.