@kaleidoscopeheart Ummm, that shit is really hard.
It's completely understandable that you're a cranky bitch, and it isn't going to change unless something in your life changes.
I'm full time.remote as well, and I would maybe get 2-3 hours of work in when my kids were home sick basically until 1st grade and they become more independent.
I know you're miserable but you're crushing it.
I don't want to shit on your partner if he's normally splitting household duties fairly evenly, but is he helping pick up a little extra right now? That's how my DH and I roll. When one of us is struggling, the other kind of swoops in and takes over as primary parent.
Also, do you need to lower your standards for a bit? When I was having a hard time during the pandemic, I would ask myself "Did I get out of bed? Is everyone healthy? Are we gainfully employed?". If I said yes to all 3 of those, I succeeded that day.
Lastly, I agree with the others. You need to get.out of the house and reset and recharge. Do you have relatives that could watch your kids for an overnight? Go out to a movie, get a hotel room with a jacuzzi tub, hell even jaywalk! (That was one of my favorite kid free activities - I'm weird)