Not much time on way to funeral. I have a yorkie w cerebellar hyoxia. I don't think that is what your little one has. There is no pain with it. Message me later I will give you more info Iam thinking you need to consider the following.
ACVS - Atlantoaxial Instability The sysmptoms sounds similar. I have heard of this condtion before and actually thought this is what my girl had. talk to you later. Good luck