Read my thread, If you can find it!
My 2 week old chick started holding her head sideways, the first I noticed it was on Friday, maybe Thursday evening (all my days have been running together lately). I actually dissolved one of my vitamins (Centrum Silver for Women) and a calcium/magnesium supplement (Caltrate with minerals and D) in some water since I didn't have any poly-vi-sol and I had read also something about Calcium and several vitamins being helpful. I just diluted it further with some more water, and just filled their waterer up with it. The two broody hens and all 4 chicks drank that for 1 day, then I started Sav-A-Chick, which I got at the feed store. One packet makes a gallon, but i just sprinkled some into a couple of cups of water, and gave that to them for the following 2 days. By yesterday, (Monday evening) the chick was holding her head normally again. I did not separate her from the others, because she was able to eat and drink, and she was managing to get around okay, her adopted mom was keeping a good eye on her.
Good luck to you, I hope it's as simple a fix for you as it was for me.