My 17 Year Old Cat Is Dieing. She Eats and Drinks Very Little. How Can I Deal With Losing Her?

I have an appointment with the vet in 4 hours and I am pretty sure I am going to have to put her down. Even though she still walks around and purrs and even plays a little, she looks very sick because she isn't eating or drinking a whole bunch. She lays down after a few steps. It looks like swallowing is difficult and her mouth smells really bad. She still urinates a lot but I don't think she is having any bowel movements. I think this is the end. Is there any hope of her making it and if not any suggestions for dealing with this? This is the only pet I have ever had and I have had her since I was 11. Help me!!! Please, only serious answers as this is very difficult for me. This is the first real loss I have ever had to experience.
thank you everyone for your thoughts. i am pretty sure that i will have to put her down so i am going to spend the next 3 hours petting her and bawling my face off. does anyone have any suggestions on what to do for her once she is gone? I just need to do something for myself and her, noone else. I plan on burying her.
everyone keeps telling me to get a new pet and the one thing i left out was that i can't. a lot of people in my husbands family are allergic to cats and dogs so i said after scamp died that i wouldn't get another one. i would love to get another pet but it can't be one with fur. so...it's kind of like losing a cat and never getting to have the one ever again. i have to deal with it, i know. i just wish i had other options.
she died at home.

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