My wife has MS. She was diagnosed in 1977. Luckily for us, a mildly progressive form. There have been bad days...like the recent time in the hospital paralyzed from above the waist down. Luckily, a remission after steroid treatment (There goes her Olympics shot) and a few weeks in rehab. We now play recreationally once a week. Going to go play tomorrow, if all goes well.
If you've been recently diagnosed, I strongly suggest you contact the National MS society and do attend some support group meetings. Many of your questions will be answered there.
MS changes your life..it doesn't end it.