Thanks everyone. I did wonder myself if she had had a stroke and if she could be going blind but her sight seems to be fine. She isn't bumping in to things or anything like that so I really hope that isn't the case.

I'm really worried as I've had her since I was about 9 (I'll be 27 next week) and would be absolutely devastated if she had to be put down. I know it is envitable that it will happen at some point, especially as she is getting older but I really can't bear the thought of it.

Thanks for your advice/support. I'll report back tomorrow to let you know the outcome. Fingers crossed it's good news xxx