Could be wry neck. I had one that did that and was told to give poly vi sol (baby vitamins) without iron. I did that for all my chicks and it seemed to do the trick. I would try it with yours and see if it helps. I did it for about a week. Put a drop on your finger and rub it along the beak till it takes it in. I did it 3-4 times a day. I also put some in their water, just a couple of drops. It stopped my chick from head shaking and flipping over. Good luck!