Don't give up!
I agree you probably didn't gain back 20 pounds in a week, but it sounds like you're really struggling anyway.
It sometimes helps me to see this as a challenge.
There's a basket on our secretary's desk at work which is nearly always filled with candy. I used to eat 4-300 candies out of it every single day. Two years ago, when I made a big lifestyle change, one of my decisions was that I would no longer eat ANY candy from the basket. I wasn't saying 'no' to all candies or sweet food, but that candy represented mindless eating (which I wanted to stop) and seemed like something that would be do-able, as I always have another alternative present.
It was really hard at first to not just reach my hand in and take some candy. But as the days went on, the feeling of success was WONDERFUL!!!
Now, I have been tempted by that candy, especially in stressful times, but I know call that basket my "
victory basket" because in 2 years I have not once eaten candy from the basket!!
Again, I HAVE eaten candy, just not from there.
Sometimes these victories seem small, but I tell you they build on each other. I am quite proud of my ongoing victory over that silly basket.
So, maybe think about small changes and challenges and other ways you can recommit to this process!
