I'm trying hard to come up with some words of encouragement that no one else has said, but the words escape me.

You do so much good work; try and get out of this funk by remembering all the little ones you've rescued and cared for. You can't save them all even though you'd like to. All you can do is your best and believe me, it's not going unnoticed. All those park kitties are soooo lucky to have you. Bless you!