Good Luck!
I don't believe you will have a problem with insurance. You've failed on interferon therapy. Your insurance has paid for 11 MRIs already in a year. Your doctor is writing the scrip.
Try to get an infusion center that is close and that is NOT a private infusion center (they charge more!)
I go to my local hospital to their oncology center. My insurance covers Tysabri under major medical ( hospital benefits) They pay 100%. It may not be the same for you, but make sure you do your homework now, so that any co-pay is not a surprise to you.
If you need any information or assistance drop me a PM. I have INFO!
PS- never say you have no options! There's a LOT of stuff still available!