@ncm22 , MS is unpredictable and indiscriminate. It has a lot of brain and all the spine to play about with!
But, it is what it is so we have to try not to worry about it. Worry won’t help the situation. In fact, it could make it worse! Don’t spend your life worrying about something that might not happen. If it did happen, you’d have to go through all the pain twice!
You’re on a treatment to reduce the possibility of relapses, so live your life (sensibly), eat healthily, exercise moderately and avoid stress. 😉