My sister had ME/CFS after she had a burnout after her second kid. She was never permanently bed ridden but sometimes had to spend days resting or recovering after strain. She's not well today, but much better than at her worst. There wasn't really an accepted diagnose for it when my sister got it, and she had to fight to be recognised as sick.
I do wish Dianna the best recovery and future progress.
It happened to me, though I resigned when I hit burnout during covid. My whole identity was just being good at my job, and then I was no longer that. In part I think some blame is also to be placed on these companies who try to make the employees feel like a tribe or family. Since I've always been alone it was easy to slip into that false sense of belonging.