Lymphoma in the stomach wall.
She had surgery last week to remove the worst of it, but they couldn't get it all without just removing her stomach entirely. So now she is recovering and getting her weight up, before the chemotherapy starts. She had stopped eating, and shed a lot of weight, turning into fur and bones almost. But she's eating now, which is good.
Everyone has something that they irrationally spend too much money on.
Vet bills for my cats is mine.