I posted this on the other thread you posted on and then I saw this one, so I copied my answer here, also. 
Hello Ki-Rin,
Welcome to the forum. You didn't mention what kind of MRI you had, open or closed, with and/or without contrast. These things make a difference in what can be seen on the film. I recently read that lesions smaller than 2 mm cannot be seen with today's MRI machines. If that is true, then that explains why a lot of people have MS symptoms, but the MRIs look normal. Until those lesions grow bigger, they may not be detectable.
Just so you don't feel so alone, there are a lot of people on this forum who are in what we call "Limboland." They have a lot of the symptoms of MS, but their MRIs and LPs look normal.
You didn't mention what your symptoms are, but has your doctor run tests to rule out other things that mimic MS?
Take care,
Julie
Can you only have one lession?? 
Linear Mode
