Computer is back! Miracle!
Or, ok, not really an actual miracle, but they only had it a couple of days and the "issue" was covered by Apple so all it cost me was the diagnostic charge and couple of days. So happy. And relieved.
There were a couple of days this week where I wasn't sure how my bank account was going to survive. Because I'm already in a lot of hot water with the van stuff and then the computer went and I thought I might need to get a new (or at least gently used "new") one and then my car went in for a checkup and I was half convinced it was going to be deathly ill but then my car was fine and my computer was fine and I backed up my system and phew. I really came out on top of things this week. Thank you, whoever!
So, yeah.... computer is back in my possession and my fingers are so much happier to be typing on a keyboard rather than a phone screen.
Yay for easy, inexpensive fixes!
(PS Back up your computer, k?)