Prefect...hello! Your symptoms are not inconsistent with those I experienced in my neurological illnesses. Look up Syringomyelia and then Arnold-Chiari Malformation. If you feel that they fit your symptoms rather easily, then a regular MRI should be able to detect both of them. You just need to ask for an MRI that includes the brain, especially the brainstem and the entire spinal cord from top to bottom. That will either confirm or rule out both disorders.
Go to a top neurologist, preferably one who is aware of and has dealt with these conditions, have him read your MRI's (in addition to the radiologist) and then, if surgery is suggested, you absolutely must get a second opinion if not a third. I'm sure you can still mail copies of these results to top doctors in the U.S. Canada may have some now, I don't know. I believe there are now organizations in Canada under the names I gave you...if not, you'll find them in the U.S.
Surgery won't help all people, but it does slow the course of the illnesses. The eye movement is concerning, and you certainly don't more nerve damage than necessary. I would read up on these illnesses (Syndromes, don't you know?) and be able to follow your Dr. when he's talking to you. Have someone else accompany you b/c it can be a lot to take in on your own. I'm wishing you well....Yours, Lenora.