Here in England there is a non-profit making organisation called bud buddies who will send you MJ if you sign a form and get a doctors note specifying your condition. They`ve got into trouble a few times with the coppers- but it`s pretty cool.
If you dont smoke they even do it in chocolate form!
In my experience it does help.
It alleviates the pain, and it makes you laugh as well!
God knows we don`t get much fun out of this condition.