I'm so sorry that happened to you! We're all here for support. I hope that joining this forum is just the first step towards where you want to be, and where you're most comfortable.
I second JulesMarion--start with your food. You lose a lot more weight from eating less than you do by burning it off. This is going to be a lifestyle change, not a "diet," so start eliminating or reducing foods that you are okay with eating less of permanently. Over time, if you stick to it, your cravings will diminish, and you'll find yourself okay with eliminating or reducing other foods. That's how it worked out for me, anyway.
Keep your chin up! No need to get down on yourself. Just keep moving, and eventually the light will show up at the end of that tunnel!