You've gotten quite a bit of advice already, but I just wanted to give a little input and share my experience to give you hope.
I was sick most of my pregnancy (lost 7 pounds at first) and ended up gaining just about 25 pounds (32 if you count the weight I had to gain to get back up to my original weight). My son was 8 lbs 1 oz when he was born and I think I had about 14 pounds still to lose to get back to my pre-pregnancy weight. Having had a c-section because my son was breech, it took a while for things to heal and my body to go back to "normal" (sagging breasts, a lumpy scar and stretch-marked thighs are things I've just come to accept as normal now). As I continued breastfeeding, the pounds eventually came off without me even really trying, but it was slow and it took almost a year! Now that my son is running around everywhere I'm down to being almost 9 pounds lighter than when I first got pregnant! It helps that my son is 1/4 of my weight (I'm under 100 pounds now) and it's like a work out any time I'm carrying him around.
I do eat less than when I was breastfeeding, of course, and I actually lost a lot of weight in the last few months when I started eating smaller more frequent meals. It was hard for me to eat well when my son was younger because he was so demanding, but if you can, try followings these ideas below and although it's not "dieting" it will help you shed those pounds faster and also help your milk supply.
1) Drink lots and lots of water.
2) Add more meat and veggies to your diet for protein and iron.
3) Eat smaller more frequent meals (about 5-6 small meals a day). This helps keep your milk supply going at a regular rate as well. It may take a few days of having to stop eating when you still feel hungry, but then you'll notice that you start feeling fuller sooner.
4) Get as much sleep as you can! Have people help you with chores and rest when the baby does. Stress and lack of sleep can make it harder for your body to lose weight. For us "controlling" types, it's a little harder to ask for help. I'm not sure of your personality, but I'm a little stubborn and independent and hate to ask for help, but when I do, I realize how nice it is!