Hi, Janice, and welcome to the community. I would suggest you call an avian vet and take him into the office for a wellness check. I am thinking it could be something neurological, and he needs an evaluation.
Did he fly into anything recently such as the walls, or a window, or a door? Did he have a fall of anykind? It also could be arthritis, but I think that usually is in the legs and feet.
I hope this info will be of help to you.
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