I know that you did not enjoy the MRI and it caused you pain and discomfort with your spasticity but it is important to repeat whatever part they want to do over. I know with one MRI I had what was read to be as a new lesion and it really scared me. Upon reveiw by my neurologist, she felt it was an "artifact" or one of those spots on the film that Uppitycats mentioned. I had no symptoms despite the large size of this lesions. So this could be just to rule out a problem with MRI itself.
I also know that you received your diagnosis without having lesions. Please remember that MS is a progressive and incurable disease (for the time being anyway) and you may very well develop lesions over time even with treatment. Lesions don't always correlate to disabilty. Some poeple have many lesions and very few symptoms and some have just a few lesions and are quite disabled. So keep the hope and try to enjoy each good day that you have. This is a scary disease and I understand your fear. We are here to support you.
Love and prayers,