OP, you're doing ok. I went through a point, about a month post partum, when I was eating a big bag of candy corns every two days!
Agree with others about making it easier on yourself and avoiding as much prep as possible. A lot of good suggestions above.
I ate a lot of whole wheat pasta b/c prep was relatively easy - made a big pot of sauce and froze it in smaller portions so it was easy to defrost and use.
Maybe keep some of those premade smoothies or protein drinks in the fridge (I like bolthouse farms vanilla chai latte) - not the absolute healthiest, but quick and easy. I also ate a lot of bagels, granola bars, and Kind bars.

Take the time (I know time is short these days) to spend 20 minutes chopping up snack veggies and keep it all together in a big container. Take it out and munch with hummus whenever you damn well feel like it - you've got a lot going on!!

When I was nursing, especially in the early days, I needed a lot of carbs. Don't be afraid of carbs!! Actually PB&J is great. Instead of eating plain rolls, spread some cream cheese or PB on a bagel and you will feel full longer.

snacks requiring little/no prep - trader joe's sliced fresh pineapple, mango or other fruit (oranges, apples, etc.), cheese stick, carrots, celery, buy greek yoghurt and mix in a packet of ranch or onion dip.

"real meals" again, trader joes has great prepped stuff - washed & cut tuscan kale (just sauté with oil and spices), pre-cooked lentils (mix with kale and pasta for a terrific dinner), even some of the frozen dishes aren't bad (channa masala, paneer chat, etc.). Roast veggies - brussel sprouts, cauliflower, potatoes, anything really will taste great with salt and oil cooked for a while at 400 degrees.

I like to make boxes or bags. I have carrots, celery, cut up cucumber in a plastic container with a stick of string cheese and a granola bar. Easy to pull out of the fridge to go or next to me while nursing. Snap peas are great too. Hummus. Costco sells cheese trays with pre sliced cracker cuts that's a huge time saver. Buy premade tuna salad. Celery sticks and
Peanut butter.

I know it's easier said than done. I always have freezer ready items like trader joes ravioli and stir fry. If you want to try crock pot items, skinnytaste.com has amazing recipes.

Good luck - its definitely hard!!

I make steel cut oats in the crockpot - a big batch to last a week. I add frozen peaches and blueberries to the pot. Doesn't require any sweetener. Filly and delicious. Cook overnight and wake up to a nice warm breakfast.