Apparently, my cat has heart disease. The vet says if she starts to have trouble breathing again she could be here one minute and gone the next. I'm not happy, as you can imagine, but I'm being rational about the whole thing, if I keep good care of her she should live for a few more years. She is happy and fine now, better than she's been in a long while. I'm keeping my fingers crossed for her, and will be keeping a close eye on her, so if I'm slow on anything at all, it's most likely because I'm looking after her.