likelihood of having MS?!

Hi, I have a question. July 31st 2008 was a tragic day for me. All of a sudden after lunch I felt completely lost, totally spaced out, couldnt do basic things, total lack of short term memory... it was so weird. Then came dizzyness that lasted 11 days...then slowly it went away... the dizzyness was so extreme that I felt things spinned around. I experienced daily hadaches that lasted for hours ..like 4 or 5 hours... felt off balance, noticed an overall lack of well being.

Anyway.. I worked in a mercury injection lab... so that was the first thing that crossed my mind...Hg poisoning! So I went to the doctor and got tested. I had a high mercury lvel in blood and urine... it wass higher than recommended but according to a toxicologist it wasnt too high for an intoxication. So she gave me DMSA (chelating) pills to bring the levels down anyway. Levels came down (not zero yet) but it was a lot lower and it fell under the safe range.  

This doctor told me to go see a neurologist to rule out other things...which I did... and he had me do an MRI without contrast. It came normal and he said that it can be a viral infection or Hg poisoning. After a couple of months I went to the best place in Houston to see another neurologist, just for another opinion, this was in december 2008.

She noticed something was wrong specially with my pupils...one wouldnt close as much as the other one so she said she thought it was MS. She had me do a Brain and neck MRI with and without contrast... an eye evoked potential... and x rays of my neck. I called Januray (2009) to see how they came out, and everything was normal. Now she wants to perform a spinal tap.

How likely is it for me to have MS after having all these tests done and coming back normal? I will get the spinal tap done anyway just in case, but Im just wondering how likely is it to be MS??
Thanks a lot
Gaucho

[jensequitur]

It's possible even without an MRI to have MS, but much less likely.  I think it's a good idea to get a spinal tap, though.