I'm sorry I'm not sure what diet pill may work, even though I've definitely tried my share! The few that I did lose a little weight on, came right back after I stopped using them- so I wouldn't exactly say they worked.
One thing I know works is The McDougall Diet, you can pick up the book at most libraries. I'm currently doing the McDougall Maximum Weight Loss plan, I've done it 5 days so far, and lost 6 lbs, I eat as much as I want- but you are limited to the foods you are allowed to have.
I hope you find what you are looking for. Have faith in yourself, you can do it!