Hi Squibbles. Have a read of the CCSVI tracking thread : http://www.thisisms.com/ftopict-8346.html
There's only patient reports in there, no off-topic discussion, so it's easy to find the information you need. To answer the second part of your question, it is so far believed that this may
stop progression. People with RRMS have shown better improvement than those with progressive, but we have to wait long term to see if there are any major changes.