If you were learning how to play the violin, would you throw it down on the ground and smash it just because you couldn't play a concerto the first day? ..the first week? ..the first YEAR?
Why no - that would be silly. Playing a concerto takes PRACTICE.
Guess what: today is simply a part of your learning to practice healthful eating. Nothing more; nothing less.
We all have times when we eat more or have days similar to yours. I still have them and I have been at goal for a while now. The game changer for me? I don't allow that to be a "reason" to abandon ship and go nuts for days on end. Rather, I enjoy what I decide to have; STILL eat my 7-9 servings of fruits and veggies regardless of whatever else I consume, then say to myself, "Well, that was delicious! Now - what healthful thing can I make for my next meal?"
No flogging or wailing or gnashing of teeth; no whoa-is-me. No starving later on. No punishment of any kind. NO all-or-nothing.
So you ate more than you wanted to. Okay. Movin' on. Now, what healthful thing are you having for lunch? How about some fresh cut cantaloupe w/ blueberries? Maybe with some veggies and a hard boiled egg or two and some almond milk? Some Baby Bell Lite Cheeses? What sounds good to Linda?
See the difference in thinking there?
This morning was simply part of you practicing. That's all.
I am still practicing (especially portioning) even at this stage in the game. I still overdo it now and then but I am WAY better than I used to be, and that has enabled me to keep off 90% of the weight and still retain my sanity and enjoy food and life. So I'm always practicing! Maybe I always will, but who cares?? As long as it works, I'm fine with that.
So don't crumble; just get back to learning your craft.