Breastfeeding Mama's! I need some advice!

How many calories are you aiming for a day? You said you've tried cutting down on cals, but remember breastfeeding burns/uses up a few hundred calories so you need to actually increase your normal limit a little bit. Try eating some extra fruits nuts and yogurts to increase your calorie intake whilst maintaining a healthy diet.

As a general rule, exclusive bf'ing burns 500 cal/day. When you log your foods, there is an option to log breastfeeding (as a food, which is weird) which then adds 500 cal to your daily allowance.
As far as foods go, I eat a lot of oatmeal, greek yogurt, peanut butter, and eggs. I work 9 hr days and I typically bring 2 pieces of fruit with me in addition to my lunch to keep my blood sugar up throughout the day. Also, it's important to make sure you're drinking at least like 10 glasses of water daily to keep production up!
I'd advise you to take it slowly. Don't jump into any super-strenuous exercise routines, and don't drastically cut your calories right at first so you can make sure to keep your supply up.
I hope some of this was helpful. Feel free to add me

Edited to correct info

First and foremost YAY BREASTFEEDING! I nursed my son for 9 mos and my daughter for 2 years and the experience was AWESOME! The weight gain, however, was NOT awesome. I am not one of those women who burn 700+ calories a day with nursing I was always starving and afraid for my supply. Please don't eat below 1800 calories a day. If you have done your profile and it gives you a 1300 calorie max, I would say add 500 calories to that, then decrease it SLOWLY while you slowly add solids to baby's diet, I'd say 50 calories at a time. Make sure you are eating a balance of protien, carbs, sugar, fat, and drinking A TON of water and getting water from fresh fruits and veggies also. Eat every 2 hours or so if you want. That's my best advice. Good luck!

How many calories did MFP give you per day? For sure add 500 to that. Make sure those calories are quality calories. Make good choices at meals so that you will be more satisfied (emotionally and physically) to avoid those crashes and binges. Like everyone else, you should be focusing on whole grains, lean meats, fruits, veggies and lots of water. Some snack ideas are oatmeal (also can help with the milk supply), fruits and veggies, string cheese, yogurt, almonds (count them to make sure you don't eat more than you think), dry cereal, protein bars (I like the Nature Valley or Fiber One protein bars), homemade healthy muffins. I found this recipe a few months ago with the intention of using up some of the baby food that we had left (my 4th is 15 months old--still breastfeeding). We all LOVE them. I have made different variations using different baby food and adding fruit (apples and cranberries or blueberries). I made some alterations to make it healthier so I will put mine next to the original ingredient. If you don't have baby food around just buy the veggie and make a puree.

Toddler Muffins
INGREDIENTS:
1/2 cup butter, softened **I use 1/4 c butter and 1/4 c applesauce
1/2 cup brown sugar, or to taste
2 large bananas, mashed
1 (4.5 ounce) jar baby food squash
2 carrots, grated **my kids didn't like the carrots so I use a jar of baby food carrots or a jar of baby food squash
2 eggs, beaten
1 cup all-purpose flour **I use whole wheat flour
1/2 cup oat bran **I use 1/4 c wheat germ or baby food grains with 1/4 c flax meal
1 teaspoon baking soda
1 teaspoon pumpkin pie spice **for the muffins with the apples or blueberries I just used cinnamon
1/2 teaspoon salt
DIRECTIONS:
1. Preheat an oven to 375 degrees F (190 degrees C). Grease 24 mini muffin cups or 12 standard muffin cups.
2. In a mixing bowl, cream together the butter and brown sugar until smooth. Mix in the mashed bananas, squash, carrots, and eggs. Stir in the flour, oat bran, baking soda, pumpkin pie spice, and salt until just combined. Spoon the batter equally into the prepared muffin cups.
3. Bake in the preheated oven until a toothpick inserted into the center comes out clean, 15 to 20 minutes. Cool in the pans for 10 minutes before removing to cool completely on a wire rack. Store at room temperature for up to two days, or freeze.

I have to eat snacks to avoid being shaky and such. What I do now is eat a small breakfast around 9, then a normal sized lunch around noon, a snack at 3, and a normal sized dinner around 6 usually. I'm trying to come away from counting calories very much because Ive been in maintenance for awhile and I don't want to count calories my whole life, ya'know. But I did lose all my weight while breastfeeding, so it can be done. Good luck.