In your situation, any worries about the car can be pushed back for at least a few months, so just make a calendar note to check on whether there’s anything wrong with it, then put it aside for now. With minimal driving it’s not getting worse, and may be nothing at all.
Follow all @backachu’s good advice, with this addition:
You have surgery tomorrow, so prioritize rest right now. Instead of thinking you have to hold onto everything, once you’ve written your list set aside several hours to let go of everything and rest. Something creeps back in your mind? Push it out. Repeat to yourself: “For my best outcome in surgery I need to be well rested. If possible I need to sleep. Resting is the most important thing I can be doing with my time right now.” If you can’t, don’t beat yourself up about it, treat yourself with the kindness you would show a friend. But if you can, it will help you react better to anesthesia and heal faster if you don’t go in depleted.
I used to enjoy aerobics classes when I was younger. Now that I’m old, after my morning chores, I put out 4 big puzzle mat squares and do those old moves (low-impact so I don’t have to put on a bra or shoes) for 30 minutes or more while my phone plays 135 bpm music and the TV plays Midsomer Murders on silent with closed captions. At 135 bpm, even high-marching in place is aerobic, and adding kicks and punches and dance moves is easy and better for the joints. No choreography, just 8 of something and switch, so I can follow the murder plot. I don’t have to change out of PJs or go anywhere or let anyone but the cat see me sweat. Afterwards I stagger into a cooling shower and come out to catch the murderer. I DON’T enjoy working out, and I DON’T get a high from having done it. But I can go to bed at night without doing guilty leg lifts and crunches in bed and waking up my spouse. So I try to do it daily.
One way to get humidity is to wear a mask. An N95 isn’t necessary, you want to be getting plenty of oxygen in your sleep, but a loose-fitting mask will still hold the moisture and warmth from your exhales. And will stay in place better than just burying your head in the blankets.
I have a theater like that, it’s my apartment, and a cat, but otherwise the same. Oh, and we can put on the captions and keep the volume at nonpainful levels.
Yeah, you might need to set up some ongoing help with your pets until you are firmly back on your feet. You will start to be able to do stuff but still need someone to “spot” you in case a pet bowls you over or gets underfoot and you lose balance.
Edit to add: Purring helps heal bones, so be sure to cuddle up and scritch those little chins and ears!
When you do meet your surgeon, don’t worry if they aren’t a people person. The skill you need is in their hands, not their personality. When you meet the anesthesiologist, (and general advice with all medical personnel) be honest about anything they ask you, like about previous drug experiences. They don’t ask to judge you, it’s to judge what and how much to give you, and how to expect you might react.