Thanks again, everyone.
I realized not long after that post, why it was that I was feeling more fragile than usual -- and at once, felt better. Suzy meandered in. Sam was her litter mate, and Sooz looked for her for a long time, I think. She's more of a homebody than she used to be, but still wanders some, especially in the warm weather. We had noticed in the morning that we weren't sure when she had been home last, so she was in the back of my mind all day, even before I realized the date. It was a relief to see her when she came in.
It's good to be able to come here and process this stuff among people who don't need the gut feelings explained.