Dr. Aretoula Fellam, Research Fellow at Harvard Medical School, has developed a holistic technique called Dynamic Meditation to improve symptoms in diseases such as MS. The MSer focuses on the symptom, finds a point of relation and using guided imagery, imagines the symptom is going away.
According to Dr. Fullam, because the brain does not know the difference between the real and the imagined, Dynamic Meditation allows the MSer to reach a state of physical peace.
It all sounds easy enough, and another article supports visualization as one of the techniques recommended when managing MS hugs.
There may be no cure, but if visualization makes life feel better, it can't hurt to try.