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Hello, I'm Dr. Deb and will do my best to help you today.
I'm so sorry about what's going on with your cat. I do tend to agree with you that stress may be contributing to her current behavior or it's possible that it has exacerbated or triggered a pre-exisiting condition which she's managed to hide until the move possibly pushed her over the edge.
Prior to this current situation, was she drinking a lot of water and urinating more than normal?
Has she slowly been losing weight or was it sudden?