I hope your MRI turns out okay. If it's even any consolation, about 20 years ago, my mother went through years thinking that she might have MS. She had some slight white matter on her MRI. At the time, the docs said that MS is hard to diagnose. Turns out she thinks the white matter could be from an accident she had when she was a pre-teen. She was literally walking across the street, and a car hit her. She passed out from head trauma, but was okay in the end. I don't know if this is the true medical reason for the white matter, but at any rate, she does not have MS.
Also, I remember about 3 years ago, visiting my general practitioner...I peeked at my chart and saw in big letters "MS?" I forgot about that until now. I don't have MS either.
Thinking of you....please let us know what the MRI results show.