Wry neck looks terrible but it's actually fairly easy to fix, the video someone else posted was what I used and it really worked. I fed scrambled egg, blended with a little bit of water and added a vit e capsule and a quarter of vitamin b complex tablet - it took a couple of weeks but worked. The other very important thing is to keep them quiet as stress makes them worse. My hen was recovering well until I let my ten year old stepson have her box in his room and she went straight back to square one in hours - very frustrating. Keep them in a covered box away from people, especially children and animals. T
he other thing you can do is give rescue remedy, that calms them. If it's wry neck the chicken should eat if you do what is shown in the video - usually they are really hungry once you can fully support their neck so they can eat.
I would say, as others have, try treating for wry neck (if you don't have vitamins start with blended scrambled egg today).