For kittentummy:

[Aphrodite]

Oh Catbelly I feel awful for you. What a hard time you are going through.

No one can tell you to do anything and the decision, you already know, is yours to make.

Because you asked, I will offer my own story.

My dog Blue. She was the best dog you could even imagine. One of those perfect dogs. Well behaved, good dog. Stories of heroics and genuine adoration between us. After babies, marriage, separation, 8 moves, camping trips, break ins, and all sorts of regular life happenings, Blue was 12 and was diagnosed with CHF. Congestive Heart Failure. I was able to medicate her with the same medications humans use, and she had no apparent discomfort. I made it a vow to her that I would not let her suffer.
One day she was no longer able to get on the bed. The next night she was too uncomfortable to lay down (her belly was bloated and she couldn't breath laying down.) I sat up with her all night and let her finally sleep with her body draped over my legs and her belly hanging between. I knew that this had to be the end. I wanted to keep her with me SOoo badly. I also knew that she wasn't going to get better and the only thing being alive meant for her was hurting.
I made the appointment the next day. I took her to the vet. I told them what had to be done. They were about to take her into the other room and I told them that I was going to be at her side. My dog was given the best gift I could give her at that point. I took her on my lap and hugged her and kissed her while they gave her the first shot. I was petting her head and telling her I Loved Her while they gave her the last shot. I said "Time to go Na-night" and she did. In my arms like so many times before.
No more Pain. No more struggle just to breathe. I took her home and buried her.
I lived up to the trust and respect she gave me.

OK I need tissue. Don't let the vet make you feel guilty. Do what your heart says. And don't be afraid to demand they do it the way YOU want them to. That (previously hard assed) Country Vet cried as hard and as long as I did that day and then sent me sympathy cards.
ok done.