Help me out..I'm a little confused. What are your symptoms *now*..not something that you experienced 10 years ago, but are not now experiencing? Or are all those things still going on?
It sounds to me like your symptoms now are the dizzyness, concentration problems and memory problems that occur when you're experiencing the dizziness? And an occasional sensation of numbness in an inner thigh and a toe?
The brain MRI you had recently has shown nothing. You have a diagnosis of fibromyalgia, and you are a smoker -- both conditions can lead to all sorts of neurological problems, of course.
As for your MRI -- I've never been an advocate of folks attempting to interpret their own MRI. The folks who do that have had YEARS of medical training and experience. If you really want a copy of your MRI for your medical records, you can request it from your own physician, and when he gets it, he should give it to you. The MRI center works for the doctor -- not for you -- and so are not obligated to give it to you. The doctor, on the other hand, works for you, and so IS obligated to give you a copy, if you request it (or get a copy of it for you, from the center.)
While indeed folks can have MS and have a negative MRI, you are right when you say that if it were MS, it would be unlilkely that it would not show up after 10 years. But then here is where the confusion sets in for me: if you're no longer experiencing those same symptoms that drove you to a doctor 10 years ago, it's possible that whatever was ailing you then cleared up..went away..and in fact wasn't MS, so no lesions where there then, nor now.
Anyway -- tell us more about what your current symptoms are now, and why you doubt the fibromyalgia diagnosis, and maybe we can help you figure out where to go next, if there are other steps you should be taking.
...I am not a doctor, nor health professional, and don't pretend to be one, here.....