As someone who has not gotten Covid but instead came down with a difficult pneumonia, I know the difficulties of keeping my O2 Levels up above 90.
I am still recovering after 3 months of this shit!! And if I go off my oxygen tank, to go to the mail box, my level drops into the 80s or even the 70s.
That is when I am feeling very "short of breath"... And YES no SAD emojis here.