It gets easier, with time.
I remember going back to work after an 8-month maternity leave with my last one and everything just seeming like an endless drag of sleepless nights and days without any time for myself whatsoever.
On maternity leave I used to be able to dress well, eat well, look styled - all while keeping the house in shape, caring for my DH and my other two, doing the school run and having everything running pretty smoothly. After returning to work I broke down crying after a few weeks and had a good long chat with my DH and with my health visitor. I then made a few changes, which have sustained my sanity since then (toddler now 1 1/2).
Here is what helped:
Batch cooking. I use one day over the weekend, where I shut myself in the kitchen for around 2 hours, leave DH with the toddler (occasionally the other two help me, but often they're shut in their rooms by choice) and prepare all the food for the week ahead, so that all I need to do during the week is shove something in the oven, slow cooker or microwave. Let's face it, a lot of cooking involves cutting veg or waiting around for rice/ potatoes/ pasta to cook, so if all of it is done at once you spend a lot less time needing to cook during the week.
Easy meals are things like bolognaise, Chicken fried rice, all pasta/ potato bakes, soups, stews, chilli etc. and most taste better re-heated anyway.
Exercise. I exercise daily when everyone is asleep. Mornings for me, but evenings may work just as well for you. If you can, buy some equipment to use at home: a bike, a weighed hula hoop, some weights etc. Keeps my sanity and releases happy hormones first thing.
Throwing a massive tantrum and making DH do the nursery run, washing up and paperwork every day. And making him look after the toddler, should he wake up in between my get-up time and his (I do this any other time during the night). Means that while I'm still doing the lion's share, I do less than I used to.
Compromise at work. It's a job, and not even a particularly well-paid one. I do what I need to, but have, for the time being, cut out all the volunteering, extra earners, unnecessary tasks and may do things to a lesser standard than before - but my standards used to be significantly above average, so I'm now more average. I have no intention of getting promoted any time soon if it means ore work, which I physically couldn't do anyway, so what's the point in over-stretching myself?
Taking up a hobby. I love my crafts, so will put in at least an hour or two at some point over the weekend - usually when the toddler is asleep. It gives me a sense of self back.
See where you can add to your quality of life, OP, and don't think you have to do it all. It's okay to have a messy house for a while - ours is only in the last few months now not the tip it used to be - it's okay to be average at work and it's okay if food is yesterday's warmed-up second helping. Cut yourself some slack and involve your DH more in helping you out.