Would you believe that during the IHD weekend meetup in Vegas, I got TWO calls, both as a backup! Anytime I go out of town, I email my coordinator, but I guess this particular weekend, my message didn't get any attention.
I was "the bridesmaid" for both kidneys; the first one I turned down because it was midnight and I knew I just couldn't get home in time, and the second one went to another recipient. But yes, I know what you mean; you steel yourself to wait years, and then suddenly out of the blue, a call comes, and while you want to grab the chance, you also know that suddenly your life will be turned upside down, and there is just no way you can be completely prepared for that year after year after year.
In these cases, I just tell myself that what will be, will be. If I am meant to have that kidney, then I will get it. If it goes to someone else, it was not the best kidney for me. I hope that whatever happens, you will find some peace. Good luck, and let us know what happens.