Dont beat yourself up. Just be good for the rest of today! And remember, tomorrow is a new day!
A treat or a piece of chocolate here or there is not going to kill your weight loss success. Just get back on the wagon and keep going!
You are doing well!
like the others have said go for a walk. Just do something a little more than what you would normally do... and don't invoke my typical saying of "well I've been bad already so the rest of the day is a write of so I may as well binge away..." Be good for the rest of the day You'll feel so much better for it