My daughters and I got 3 ducklings at a local feed store a few weeks ago. I noticed some issues with my oldest daughter's duck - turning head, falling over etc. I was advised on here to start a vitamin suppliment which I did the next day. The duckling had been improving and I was finally starting to feel relieved that the problem had been such an easy fix. She was steady on her feet her neck was almost straight and she hadn't fallen over in over a week. This morning I stated noticing she was acting "off" again. Now she is falling all over the place her head is upside down and she is using the top of her head to help hold her up. When you look at her you see the underside of her bill. I am scared to death and have no idea what to do. She took a total turn today. What do I do?