If I told you that I had done this, you would probably give me a big hug and say' You aren't a failure till you give up!' and make me a cup of decaff tea.
Which is what you need to say to yourself.

And then say 'I'm only 20lbs overweight, for goodness sake, with all the pressures I am under, and the period thing making it hard every month. The world is so full of gorgeous carbs and I am only 20 lbs overweight? I must be tough!!'

And have a better time next month