RVP, I know it must be terrifying but it's gonna be ok.
Ask for tamiflu - it does wonders for pneumonia.
Try breathing slow long breaths which should improve oxygen levels. It's normal to dip below 90 with pneumonia.
Just don't google about Covid & oxygen levels below 90 because that's actually rubbish.
Ensure there's a humidifer in the room or just breathe in some steam once an hour to help with breathing.
Most of all you just need to relax and let your lungs recover. Don't think about the pneumonia, long deep breathes, eat even if you're not hungry- brasil nuts in partcular. Anything with selenium can help repair damaged tissue quicker.
Relax, sleep, eat, think of this as a forced holiday.