Doing much better since yesterday. No idea why. Went to the office, debugged some code that had been haunting me. The "bug" turned out to be minor, although the dread was big. Laughed and talked nonsense with a colleague. During the drive home, the radio played consistently great music. Went to IKEA with my SO in the evening, bought some little things... Slept OK although I've had a persistent headache. Feeling hopeful.