Six weeks ago I bought some pekin ducklings from TSC. They have been happy and perfectly healthy since I got them but today one of my males started acting funny. He was laying by himself sleeping instead of playing in the pool with the others, so I woke him up and got him to walk and he acted dizzy with his head turned a little. After a few minutes he started to shake his head and run around backwards like a bug was biting him or something. When he calmed down I held him and tried to feel if he had a neck injury or something. It kind of felt like the muscles were tight like he had a knot in it. So I rubbed his neck and after a while it loosened and he acted perfectly fine. He walked around and acted normal then I came back later and he was spazing again. When he calmed down I gave him nutridrench and I'm not sure if it was a good or bad decision but I gave him half a cc of b12. Ive never given b12 to poultry but it always seems to help with the goats so I just tried it anyway. I YouTubed duck seizures and that is what it looks like but less intense. I've had ducks in the past but I've never even heard of this problem. Could it be a disease or is this kind of thing common? Will it go away or is there anything I could give him, or should I just wait and if it gets worse put him down? If anyone knows anything about it and could help it would be greatly appreciated. Thank you.