Rooster Head Injury!

[IreneArm]

I have a 2 year old Sebright Bantam rooster who is having nerve problems. He twists his head 360 degrees around and has a hard time eating. He fell into water during the winter, and I dried him off as soon as I could, but he hasn't perched on the roosting bar since then or crowed. Recently his right foot is curled like he's trying to perch, but it won't uncurl. He's ended up walking on his knuckles. I gave him 3 vitamin B shots, but they didn't seem to work. I separated him from the other chickens. Suggestions? Help?

 

[nuthatched]

Whats his normal diet?
What doses are the shots, how and how long ago did you give them? Is he vaccinated for mereks?
He's not a sebright.

 

[IreneArm]

Whats his normal diet?
What doses are the shots, how and how long ago did you give them? Is he vaccinated for mereks?
He's not a sebright.

He's free-ranging with the rest of the flock, and usually eats the layer food. The shots were 4 ml on March 15, 17, and 23, so about a month. I don't know if he's vaccinated; I got him from a friend who got him from a hatchery. He may not be a sebright, but he's definitely a bantam.