Hi Josh,

Sorry you are having to deal with this rare disorder. When did you last have a CT Scan? I found this on patient.co.uk - a quite technical site written by Doctors:

Syringobulbia
This occurs if the syrinx extends into the medulla of the brainstem. The cranial nerves become affected:
Facial sensory loss can occur as the trigeminal nerve becomes involved.
Vestibulocochlear nerve involvement causes vertigo and nystagmus.
Facial, palatal and laryngeal nerve palsy can occur as the VIIth, IXth, Xth and XIth cranial nerves become involved.
Weakness and atrophy of the tongue is caused by XIIth nerve involvement.
Quote.

Could your syrinx have extended to this extent?

Feeling for you.

Dave.