I feel for you...
I've had two Sibe Huskies that I've had to return last minute, the first one we kept for a day, and then took back.
I cried like a baby.... my first dog, and it was not to be.
I truly mean it when I say I've been there- it's heart wrenching, but in time, you will be able to get a dog when the dust settles.
There's nothing like waving goodbye to the first one though.
The second was at the breeders the whole time, and he probably went to a better home than I could offer.
I feel for you... stay strong. I know it ain't easy.