I didn't take Betaseron in the long ago when it was offered, knowing I was sensitive to many drugs, and reading the side effects on the box, which included severe depression.
But later I had terrible peripheral neuropathy pain when I tried Interferon Alpha for another disease. Had to quit.
So, I decided not to take drugs for MS 26 or so years ago (can no longer remember when i was diagnosed, exact date, as dx was made over some period of time). I immediately went on the Swank diet and i recommend you try it. I had the advantage of knowing personally a doctor with MS who had excellent results with it (she was a friend, not my physician). I know it helped because I would immediately lose some of my coordination when I got off it for two days, such as eating red meat for two days in a row. I know it may not help everyone.
If you do this diet, you need to really follow it, as if it were as important as taking a drug. You can't sort of do it, especially in the first year, Dr. Swank says. It sounds like a loss but there are so many good things you can eat and experiment with improving flavors without high fat. I got really expert at crock pot cooking, and my husband loved the meals. I know that cooking is difficult for some with MS--how I hate the cleanups.
However, even if you decide to take another drug you could read Swank's first book. It used to be available at any library.