Hi Simca!
Welcome!
Please don't feel ashamed of yourself! Use this experience to evaluate what went wrong with your plan this time. It may help to write down everything that you did during those two years that you maintained your weight. Obviously you know how to maintain because you were doing it! Don't think of it as going on a diet to lose weight. That gets us all messed up! Think of it as creating a plan that works for you and will continue to work for you.
As we age we need to revamp what we did when we were younger. Our metabolism changes because WE change.
I'd recommend trying Fitday. It's free and a great way to help you keep track of calories and exercise. Here's the link!
www.Fitday.com
Cheryl