I have to back up the other members here and say that what you have been through sounds suspiciously like MS. You are not in good hands with this neurologist.
He has ignored screaming signs of spinal disease. Clonus (extra contractions with a single tap) is a VERY abnormal physical finding and screams disease. "Brisk" does not descibe clonus. The term would be "pathologically hyperactive". When the reflexes are different from side to side (called asymmetrical) it is another tip-off to look for something like MS.
A neurologist that doesn't look at his own films is not worth his salt.
Then he gives you multiple explanations for the same thing: Lots of people have these lesions (NOT!), you were probably born with them (then why are you just having symptoms now?). Mistyless, have you read the thread "Lies my Neuro Told Me"? If not you probably should.
http://www.medhelp.org/posts/Multiple-Sclerosis/Lies-My-Neuro-Told-Me-or-Common-MS-Myths/show/1074879
He has committed at least four of those "lies" with you, ie; No change in the MRI means no MS (WRONG!), Pathologic hyperreflexia is not a possible sign of MS (WRONG!), Everybody has lesions (WRONG), You were born with lesions (WRONG), I don't have to read my own MRIs (wrong, wrong and WRONG!)
There are two kinds of nerves, sensation (feeling) and motor (movement). The sensory nerves carry info TO the brain so we can feel sensation, pain, hot/cold etc,. the motor nerves carry info FROM the brain to the muscles telling them to move. A damaged motor nerve will result in a muscle that doesn't move well and feels weak.
Even though no one can diagnose anything online, you appear to have fulfilled the needed criteria for MS. 1) You have had more than one attack of symptoms suggestive of demyelination. 2) You have evidence of damage to the central nervous system in more than one area. 3) If the mimics have been properly ruled out (and this seems doubtful with this neurologist, then the 4) abnormal MRI pushes you over into a pretty definite diagnosis. So, ruling out the mimics seems to be what we don't know.
So, I am glad you are seeing a different neurologist who is interested in MS. That's all an MS speicalist is in this country. There is not official certification. A doctor just needs to see 50% or more MS patients to qualify as a specialist.
When you see the new doctor be sure you describe the separate bouts of symptoms and tell him that your reflexes showed clonus. Your regular doctor should be able to verify this for you and for the record. All doctors are taught the neuro exam in training.
Even if the doctors in New Zealand follow the McDonald Criteria, you would likely qualify for a diagnosis on the basis of the 4 things listed above - just the rule out process needs to be complete, and that is very important.
Stick with us!
Quix