Where's the balance?

I've written about this before, perhaps nearly word-for-word with the following...

Where is the balance?
How do I balance my ongoing concern for Ani's condition with my call to lean on God?
God's hand isn't going to come down and put formula into Ani's tummy, that's our responsibility, given to us by God when she was born.
But, for my own peace of spirit, how, practically, do I have peace when Ani is in pain and I am powerless to help?
It seems selfish to seek internal peace when one's child is not at peace.