Dr. Mercola, says to Beware of Conventional MS Treatments (partway down the page) from http://articles.mercola.com/sites/articles/archive/2011/05/17/american-cancer-society-and-dermatologists-dead-wrong-about-the-sun.aspx

Some inexpensive  nonchemical aids for your symptoms. Many, like Vitamin D are well known. Others may be new to you.Might be worth having a look and maybe even trying some of his suggestions.