Thanks, now you've mentioned it, she has been tilting her head a lot the last day or so, as my daughter remarked 'she keeps looking like she wants to ask you a question'.
She's been fine overnight, the lip smacking stopped about 2am, and I think I fell asleep properly about 4am, and sometime after that she'd taken advantage of being upstairs and hopped on the bed, which is fairly high, so she must have managed a fair jump. She's been happy enough to go for her morning walk, though she stayed right beside me even off lead and didn't do her usual mad chase the seagulls thing. As soon as we came home she went straight into her crate after and hasn't mooched while Ive been getting breakfast.
Her eyes seem ok now, and I didn't notice anything about them yesterday, though they get lost a bit in face-fluff the week before she goes to the groomers. She does seem very tired and subdued though. I'm going to keep her by me all day today, and she'll be at the vet first thing tomorrow, or if I see anything odd like her eyes going today, I'll be straight back on to emergency vet.
Now I think about it, she had very similar symptoms on Xmas eve last year, accompanied by terrible vomiting. She'd recovered her gait by the time we got her to the vet - I think we had to wait about two hours before she was seen - and the vet just kept saying she clearly had no injury, and didn't seem to get what I meant when I said she wasn't limping, it was more her legs giving out on her. She (the vet) put the vomiting down to the Atopica she'd prescribed for her skin, so she changed that to meldrone, and she has half a tablet of that plus two piriton a day.