Palm will have surgery tomorrow. I'm terribly nervous ...

Palm is an old shepherd. She lives with us for the third year. Someone left her in an abandoned house. She is big, tired and very wise.
I don’t know if her life was good, but she has health problems. She has very bad teeth, a bad heart and arthritis. A month ago, I discovered a tumor the size of a nut on her stomach. Since then, the tumor began to grow rapidly and now it has become the size of a fist. The vet has scheduled an emergency operation. Tomorrow morning we are going to the clinic.
I'm terribly nervous but I hope for the best....