It will be very hard on you, especially returning to an empty house - especially when you find your pup's toys or automatically call her name. But eventually you will remember the good times and laugh at her antics. Try and keep your happy face on for your pup's sake as hard as it will be. You can cry afterwards.
I agree with the posters who recommended euthanasia since your pup is in pain. The way we did it (as recommended by a fellow pet lover) was to have our vet come outside (in the summer) and give our pup a serious tranquilizer to help him fall asleep. Obviously the tranquilizer shot was not the final shot, but since he loved our vet he did not see it coming. We waited until he fell asleep and then took him in for the final shot. Yes, we had to pay for the extra shot but it was well worth it to us.
Just prepare yourself - it will not be easy. Nor will tonight.