I got tears in my eyes reading this. When you said "I'm scared, Mum, what's going on?" That brought the tears on big time. It reminds me of when Zoee had her "episodes" and she had that same look in her eyes. And the worst of it is WE don't know!
I'm so glad she got better and you saw the vet. I hope it doesn't happen again and she remains healthy.

Hugs to you and Sugar!!