Thanks everyone.

Our vet phoned earlier and said she was doing a bit better and was a little more comfortable and relaxed now (thanks to the pain medication). She still can't move her back end or anything obviously, but at least she's not yelping everytime she goes to move positions and isn't panting and shaking terribly.

It feels so weird without her, and so boring. I can't imagine living without her permanently. She's not even 5 years old yet. I guess it's even harder because Echo was about the same age when she had to be PTS and that's all I can think about.