Just when I think I've seen it all, another symptom appears out of nowhere.
Today, I woke up with pins and needles in the fingers and thumb of my left hand. It was nowhere else, just the left digits.
After a couple of hours, the pins and needles stopped, but my fingers still didn't feel "normal" for an hour or two more. They just felt "heavy" or "dull".
By coincidence, I was seeing a GP today anyway, just for some prescriptions, so I asked about it. (My regular GP is on holidays, this was someone else at the same practice.)
The GP had three theories. It could be a pinched nerve, because my left shoulder was extremely painful today. It could be the vascular changes that go with lupus, since some vascular oddities have already been observed in my brain. Thirdly, it could be something completely different, he didn't know what.
The decision? Don't worry about a once-off, but if it happens again, ring the rheumatologist.