Talk with your vet about whether x-rays, ultrasounds, or both are needed. They look at different things, and even doing both can be more economical than shipping somewhere for a scan.
I’m sorry you’re going through this. There is another thread on CoTH where we talk about neck issues and surgical correction. I don’t know if that could be in the cards for your guy, as it seems like it’s an anatomical issue, but you can go read there on our experiences:
Cervical OA and Basket Surgery (cervical interbody fusion) experience.
This thread is old.
I ended up selling my horse to a family I knew that wanted a trusty leisure trail riding horse to use occasionally, which he was perfect for (can sit for months and hop on and go ride). They still send me pictures and videos from time to time. He’s teaching little girls to ride and they fight over who gets to ride him! I miss him dearly but he’s got a great home and doing wonderful in his second career. It makes me happy that he’s bringing joy to little girls who love him.
Old threads can be super helpful.
Knowledge and experience are timeless.