I should knock wood, but things are going really well.  The upped
Cosequin combined with the Cyproheptadine, and re-intro of Prozac,
seems to be a winning combo.  

Carey is not yowling, not attacking the other pets, not peeing outside
the box, and she's being her sweet and playful (or sleepy) self at
other times.  

I'm hoping this continues obviously, but right now I'm feeling really
hopeful that the household can be peaceful and clean.  Not ready to
stop using the plastic tablecloths on the sofas overnight, but I can
at least envision that!

Thanks everyone who has shown understanding and offered thoughts -
Carey means a lot to us and we just want to live a normal life with
her.