Bummer that the breast feeding didn't work. I think I read somewhere that it burns around 800 calories a day. Whoa!
It's hard to really advise you on this type of forum. I mean, losing weight is losing weight, whether it is baby weight, or being lazy and haven't been to the gym in a year weight. I think people say baby weight is the hardest because it comes on more quickly than poor diet, so it seems more impactful. Still, a fat cell doesn't know how it got there, and doesn't care...
You know the drill - cut out excess calories, ie. sugars, useless carbs, junk food. Start exercising - whether walking, running, swimming, yoga - get moving.