Great news!!
As for Vitamin D, it is a GREAT vitamin to supplement, especially for MSers. Here is a WONDERFUL article about the benifits of vit D, and even how it coorelates with MS. D3 is the best type of Vit D supplement to take. You CAN take up to 10,000 IU a day without adverse effects. Most recommend 2000-5000 iu daily though.
http://www.lewrockwell.com:80/miller/miller25.html