Looks somewhat similar to a chick I've seen before with sever wry neck. Could this be the case? It does look bad. It could be neurological,
@Isaac 0 any suggestions?
@KaleIAm and
@Miss Lydia will also have suggestions.
Great job taking him in! Hopefully the experts will chime in soon to help.
A few questions-
What are you feeding him? Brand as well.
How would he have gotten a head injury getting out of his shell? Can you elaborate on that?
Is his appetite okay? Can he eat and drink?
Is he alone?
Ducklings don't to good alone since they are flock animals. If he's by himself, you can add a stuffed animal, or warm bag of rice for him to snuggle with.