Stop being so facetious.
You seem to be forgetting that the OP has her own business with clients she is answerable to, as well as all of the other things that come with having your own business that employed people don't have to worry about. If she needs to book a meeting room she doesn't have someone to send 20 emails to do it on her behalf like whoever you work for.
She has to make sure she's sending out and chasing up invoices to make sure she gets paid, keep her records up to date for tax purposes, keep meticulous personal finance records for her self assessment as well as her business tax records - none of which an employed person has to do.
She is responsible for her own knowledge development - no corporate mandated training courses for her like an employed person would get.
She is doing all of that on top of running her household (mental load) and doing all of the day to day requirements needed for life to function with a three year old that doesn't sleep.
He gets to get in his car / catch the train / plane on a Monday morning or whatever, go to work, get three or four nights of sleep undisturbed by a sleepless three year old with all of his meals cooked for him. On a Thursday he gets to catch the plane / train / drive home. He will get a paid at the end of the month, most likely through PAYE, doesn't have to worry about tax returns, liability insurance, finding clients, keeping his training up to date. Hell, I bet he doesn't even have to book his own hotel rooms and travel!
I run my own business, am the higher earner AND do all of the mental load tasks at home.
My job is highly complex (more so than having to send 20 emails to book a meeting room) as well as having all of the extras that come with self employment and I do the vast majority of mental load house admin.
The day to day household and life organisation (e.g. mental load) is a lot more complex, its bitty, inconsistent and varied more so than anything I do for work. When you are the only one doing it along with self employment, it is exhausting.
I am lucky in that my DH does a lot more of the day to day chores - he does the food shopping, cooking, most of the laundry and the weekend activity lifts for the kids. If he didn't I would really struggle.
I can't imagine doing all of that AND all of the day to day household chores on my own for half the week. It must be hell and I am not surprised the OP is burnt out and resentful!