My warmest and happiest congratulations Ephie on your new baby girl. And wow oh wow, on all the other balls you are juggling. Your plate is uber full.
My juggling act with career and new baby tips were like this:
Determine now what is necessary and what is not. Breathing, drinking, eating, sleeping, loving your family are top of the list. Dirty house, messy car were not top priorities any more.
Being prepared is half the battle. Showing up is the other half.
I kept my wardrobe simple for the entire family so laundry was simple. We all wore the same colored socks for years, the same colored pants and shirts too. Now my kids wear mix-matched socks, so it doesn't matter. Black or khaki slacks go with everything, IIMHO.
You must eat well during this transition. High protein. Good carbs. Always take a pre-natal vitamin. Drink lots. Salty snacks are actually good for you while nursing and working. They'll help with the afternoon slump as well.
Cook once, eat twice. Meaning, make planned overs. So less time is spent both shopping and prepping and cooking. Pots of chili, spaghetti, soups, or casseroles and lasagnas are great leftovers for lunch. My fast, go to lunch was a turkey sandwich on whole grain bread, slather on hummus instead of mayo, throw on cucumber, tomato, lettuce, onion that's been pre cut, or add carrot sticks on the side.
That's wonderful that your husband helps with the grocery shopping and cooking. I did not have that help at any level. For breakfast I always ate a good healthy whole grain cereal or oatmeal with pre-cooked sausages or bacon or eggs. My favorite work breakfast is Muesli or oatmeal type grains mixed with vanilla yogurt the night before, let it sit int he frig and take it with you. I get those pre-mixed grains like hemp, chia seeds, dried cranberries, raisins, whatever you like, it's fulfilling, healthy and if you use a whole fat yogurt you don't need huge amounts, just a normal amount to give you the extra calories you need while nursing.
And you know what will start to happen over the next month? Your hair will start to fall out. All the beautiful hair you grew during pregnancy will start to appear on your work chair and in your hairbrush. Just a little reminder.
Love and hug on your kids at night to fill up both your emotional cup as well as theirs. You'll all focus better if happier.
And like the others have said, the first couple of weeks of any transition is difficult. You all have new routines to learn, new names, new places, new expectations. You're bound to be exhausted for a bit.
Best wishes to you and yours!