Hi Evie, welcome to BYC. So sorry for this traumatic event! I have chickens, not ducks so i can't really answer your question except just to guess. How old is your duckling? Until you can get replacements for his buddies, it might help to provide him with a mirror and a stuffed animal. I don't think he will die in a week. @Isaac07 or @WVduckchick might have better answers. Good luck to you!
Edit: help, BYC, am I flagging the right Isaac?
Just " Isaac 0"
