This is one of the reasons why I left work.
I always thought I just had poor work ethic. Genuinely struggled to like a job nevermind love it.
Always too exhausted to meet arbitrary targets, always getting in bother for not doing enough when I was giving more energy than everybody else and getting there half as fast. Systems changing. Policies changing. Procedures changing. Being shamed for not being able to break away from what I know. Getting disciplinaries. Capability hearings even though I was slow, I had the best success rate in % terms. Needing 30 minutes between most consultations where most people took 5-10.
Eventually left me in a really dark spot. I'll not go into the details but I was declared not fit to work, did the LWCRA assessment, applied for pip, didn't expect to get anywhere but the evidence I had provided was in their eyes substantial, and was awarded PIP.
I think its only after I went down these routes that I actually realised how disabled I actually am by being autistic. I can't leave the house without a chaperone for example. For the longest time it felt like a choice I chose for convenience but it all sunk in that it wasn't a choice just out of convenience but out of necessity and comfort once I dissected the why of not being comfortable leaving the house without someone, and suddenly my family being able to open up to me like "you were a nightmare getting to school, if the bus was late or early you would just come home or if there was a deviation you'd get the school staff to ring us to collect you" and the dots started being connected.
Basically because of black and white thinking, I thought well I am physically capable of getting on a bus, I can mechanically make my arms and legs move and step onto a bus so therefore I should be able to get on a bus and go to work I powered through for almost 30 years when I can't do those things like other people, and it's not normal to have so much stress at the end of the day from these non-events that you peel the skin off your feet in long strips that get deeper and deeper until you can't walk, or pull your hair out so you've got bald spots, or your throat to squeeze so tightly your epiglottis cramps up, and by 5pm you feel like you've used your word count allowance up for the day.
I'm in a place now where because I am out of work, and I'm a lot less stressed, I am questioning again whether I am genuinely autistic because it's been a while since my struggles have been so extreme, and sometimes I fall for the things ableist people say, and then I push myself again and realise that I am in fact still disabled.
I am trying to set up a small business, but that requires networking which is a big hurdle for me. Even social media posts to promote are a hard task. I also worry I might not be able to keep up the pace enough to make a business sustainable so even though I have everything I need to start, I just can't get there.
I realise not everyone is in a position to take sick leave for burnout and on mumsnet especially there can be this mantra of if your arms and legs aren't dangling off then you should 100% go into work and not inconvenience your workplace or colleagues, but if you are in a position to take some time off and you need it, then I would. You've already said it's impacting your relationship with your child, and your health should always come first.