I would see this vet:
Dr Sisson will do phone consults and will work with your vet if you cannot make the trip... Dr Sissons contact info... he'll need copies of all tests... but call they'll tell you what to send.
Allen
Sisson, D.V.M., M.S.,
Diplomate ACVIM Neurology/Neurosurgery
Angell Animal Medical Center
350 South Huntington Avenue
Jamaica Plain, MA 02130
Tel: (617) 522-7282 (press 4, then 2 when the automated operator message begins or 6 to speak to someone)
Fax: (617) 989-1648
asisson@mspca.org