Oh Wendy! I know how you feel because I did the same thing last year. I had to take three kittens to be adopted and it broke my heart too. What is funny now, but not then, I was the one doing the crying and my daughters were comforting me. I thought I would be comforting them.
You can rest easy knowing you took care of them and gave them a good home while you had them and I am sure they will find a great forever home. Lets pray our heavenly father will make sure of that.
Vanessa