Wow. Your post made me dizzy!

I say that with love! I have to address something though- your final words were, "what does a neurologist do?" Isnt that what you asked? May I ask you- who the heck told you that you might have MS if you didnt see a neurologist? IF it wasnt a neurologist, run the opposite direction and go find one.
A Neurologist specializes in the neurological system. This can be anything from Strokes, Migrane Headaches, Parkinsons Disease, Multiple Sclerosis and a thousand other diseases! A neurologist will start out by doing a neurological evaluation. This is done with everything from balance tests to spinal taps! A normal neuro eval lasts up to an hour long, is started with a very intense history and question and answer session- goes on to be a complete physical including the above mentioned balance and reaction tests, many times gait and eye tests, usually accompanied by some specifics, depending on your complaints. A neurologist usually orders an MRI, which is where he is looking for abnomalities- and blood work. This is used to determine if the cause is something treatable, or as simple as a deficiency. It can go full steam into an EMG, a nerve conductivity test and yes, the aforementioned Spinal Tap or Lumbar Puncture. Let me clearly state, a Neurologist does NOT do all of this at once...its a progressive thing (much like MS!)
MS is diagnosed by ruling out every other possiblity. Therefore, tests are done one at a time in order to make sure that something doesnt show up, giving the doctor a more specific direction to take in his diagnostics. A spinal tap is not always done however MRIs most usually are. MRIs are done of the brain and spine most commonly.....
Neurologists can specialize in any particular disorder or disease. An MS specialist is usually recommended at least during the diagnostic period, until you have confirmed you have MS, you certainly wouldnt want any other type of doctor treating you!
This is what a neurologist does....now, who scared you into believing that you might have MS? I have to say, reading your post over and over, there is very little here that screams MS; and yet there is a ton of info you provide us which might be related to sugar problems, or even anxiety! Please, go have blood work done and talk to a Neurologist! Something tells me you are going to need some ruling out before a diagnosis can be made!
Nikki