That's tough, because even if they both diagnosed you its still a tough decision to make.
Have you gotten new mri's to see if anything has progressed? You can also look at less intense drugs such as copaxone. I have been on that for over a month now with 0 issues. Personally, I wouldn't even go the medication route if it wasn't for the fact that I am a man. It tends to be more aggressive for men.
There are other routes to take as well like diet, exercise, nutrition. These also play an important role. Doing things in regards to all them is your best bet.
Best of luck, and hopefully you don't even have it or develop into it