Then this morning when he tried to get up, his long lurcher legs gave way and he panicked again, tried to flee from his scary non-working legs and hide under our bed, only that scared him even more and he ended up crashing into the bed and wetting the carpet. :-(
This morning, he managed to go out into the garden and has eaten some cat food and his pills. Then he even demanded a walk, so we very slowly walked up the lane and back again when he decided that was far enough. Yesterday morning he leapt into the car and went galloping (albeit rather slowly, in a slightly wobbly manner) across the hilltop in pursuit of bunnies with Brythen: such a contrast! But maybe that was too much.
He's now fast asleep and seems very peaceful. I'm shattered! Fingers crossed for a better night tonight. I can't really leave him as he is at the moment in case he panics again, but I'm hoping this is a one-off.