I had my first child in march of 2007 then in june of 2007 i started on the depo prevera birth control shot. between both of these I gained 55 pounds. I am 5Ǝ and 215 pounds Ive been on a low calorie low fat diet with exercize since I had my son and nothing helps.

I think you are eating simple carbs and possibly not enough calories, and your metabolism has slowed down.
Try low carb, low fat, high fibre, high protein, and exercise. The foods are low caloried, and yet filling and healthy. Brisk walking is great for burning body fats.
It is my lifestyle now. I am on low carb, low fat, high fibre, high protein and a hour brisk walk 5 times a week, and I have lost 31lbs/14kg and gained better health. I am now maintaining my 108lbs/49kg for more than a year, with more fruits and complex carbs.
Details such as my experience, meals, snacks, recipes, foods to buy, reading labels, walking as an exercise and to shape the body etc etc, are in my blog

dont use wait lost pills go jenny craig i waid 254 now im 124 exersize for 1 hour every day eat fruit and vegitibles eat FAT FREE icecream and FATFREE milk