Quoting this as this is exactly how mine presents, except mine is not mild right now. "Wading through treacle" is also a fantastic way to describe general feeling of movement, and thinking Id say. Diagnosed in 2008.
I am effectively housebound at the moment, and symptoms frequent and severe. I've had to take 2 months off WFH work because I'm totally out of it ATM.
It's been up and down over the years though and when it was really mild, I was able to do more, have a part time job outside the home and even ran 2x a week running 10k, and gym 3x.. but still needed a lot of pacing to avoid worsening and to carry on. Had to be super careful. I couldn't do an extra gym visit, and if I did do something extra like a weekend at the seaside, I was too unwell to do other stuff for a couple of weeks. Kinda like that.
Usual day I'm up at 7am, feed cat, work at 8am (no lights in office, blue filter on laptop, adapted workstation etc,), finish at 4.30pm, partner makes dinner, bed by 7.30pm - Partner has to help me up the stairs by then, with heat packs for pain and stiffness, will fall asleep by 10pm if I'm lucky! Sleep is uneasy and broken despite being exhausted.
Even watching TV is something off if the menu and feels like a big activity if you do it. Very little fun allowed lol.