From what I have seen, LDN provides positive results for about half the people who try it. While it does nothing for MS as a disease, it does boost Endorphin production by the body. This results in a much higher state of well being. So, while it doesn't do anything for MS, feeling better can be a great thing.

As for CCSVI, there is information starting to indicate that the Vein condition may be an effect of MS, not a cause of it.

There is much to be learned about these things, it will take a long time.