That was a heartbreaking video to watch. My heart goes out to this woman and her family.
In my experience, having caught covid in March 2020, fatigue is the problem. It's just that calling it "fatigue" doesn't spell out how dehabilitating that aspect is. It's maybe 100 ft/30 meters from my bed to the kitchen. At the worst of my long covid, I was getting winded walking from my bed to the kitchen. So then I'm in the kitchen, I'm supposed to make food for myself. But it's not like I could stand up for any amount of time. Chopping vegetables is right out. Making anything more advanced than microwave food was too difficult at the worst of it. And even then, figuring out the directions on them was sometimes too complicated. And I figured out C pointers and passed calculus. You don't know how your body can fail you until you can't do something that should be trivial to do but you simply can't. It's easier to see for physical maladies - you'd not ask someone with two broken legs why they can't stand up.
Fatigue in a Long Covid context means it's too tiring even to just watch Netflix. That the exertion to sit there and focus your mind even slightly is beyond you. People are able to put Netflix on in the background and still fall grasp most of the story. With long covid, following a plot, just listening, with all the power you have remaining, is simply asking too much of your body.
The most damning part of it is the aftermath from any significant physical exertion. Like going to the doctor in person. Remember, it's a marathon of exhaustion going from bed to the kitchen, so leaving the bed, getting dressed, going to the doctor, sitting the waiting room, filling out forms - remember your brain only barely works so writing out the answer to eben the first question, name, is a challenge. Seeing the Dr, hopefully they're of any use. Then you have to dance for them and take their tests. Finally you get home and crawl back in to bed, exhausted, so you take a nap. You wake up after that nap get some water and go back to sleep becy you're still tired. When you wake up it's literally been 4 days. You pushed yourself because going to see the doctor was important, but the overexertion of going to see the doctor wiped you out and not only were you bedridden for four days, but you were unconscious. That forces you to recalibrate your whole life. You can't just push through things and stay up a bit late or go out to see friends without stopping to think (which, again, is in and of itself a challenge in ways it never was before)
is there anything I need to be conscious for in the next four days?
So at least for me, "fatigue" was the primary complaint (followed by "brain fog"), it's just that without spelling out what fatigue actually means in the context of long covid, it's not apparent what that actually means.