Either that, or I had a massive attack of incompetence.
See, when I last went to the shrink, I was given a 'two months' appointment. My appointments are nearly always on Thursdays now, for some reason, so I wrote it up on the calendar for today. Just before I was about to head out to catch the bus, I looked at my appointment card. On the card, it read the 28th, whereas it was marked up as the 27th.
Thank goodness I have the number for reception at the Caludon Centre. I called them to check, and indeed my appointment is for tomorrow.