Hope your bird has the best possible outcome. I'm going to read up on Newcastles, I have heard of it but, know nothing about it.
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Looks like Newcastle to me. I am sorry it took me so long to respond; I was driving. But as soon as I saw the video, I thought ND. A few questions, and this is not medical advice, any other birds showing clinical signs? How many birds are at risk? How old is the bird? Where are you located?
My other differentials include an ear infection, a bacterial infection in the sinus, a tumor, or a traumatic injury. At this point, your best to give supportive care as long as you feel the quality of life is not at risk.
Have a nice night.
-Dr. Luke
This bird had totally different problem, it was properly an egg bound hen..... Newcastle disease. It's not you first time ... !