Well there are a few things that you can do that will work great! I am 5'7" and weighed 180lbs when my daughter was born and went down to 130 in 3 months and am now at 113lbs (she is 4 now).
Since I couldn't work out for a little while I started with a healthy diet. I ate Special K cereal for breakfast, and for lunch I had a grilled chicken salad (with whatever I wanted on it, but had to be fat free dressing, and I would cook the chicken with dinner the night before). For dinner, I just ate with my family. I didn't have any snacks in between, but if you must I would only recommend fruit.
To maximize results I would jump on an elliptical 4 days a week for 30 min (this is how I lost it the fastest!!).
You can also look into local natural health stores, or your physician for B-12 shots. Which help assist you by giving you energy and lowering your appetite. And you can't over dose on B-12 so it is sooo much safer than trying a diet pill. I also just learned to start adding spicy food to my meals. By eating Jalapenos (or hotter) it makes your metabolism increase because they are harder to digest (for best results eat one 30 min before meal). I use Habanaro (sp) sauce on my bagels and cream cheese every morning. And add Jalapenos to almost everything.
Good Luck!
PS. Health Zone in Tampa is where I get my b-12 Shots. You can make appointments on Tues, Wed, or Sat. $25.