Not matter what disease you may have, as a patient it is very important to discuss medications and other treatments with your doctor. Always share information regarding each drug you consume, as well as vitamins and supplements. The only way to know how changing your drug consumption will affect you is to look at your situation in the big picture. Find an MS neurologist who is best able to address your healthcare needs from an MS-related perspective. Then talk to your doctor about your concerns.
I am not 100% sure whether you are asking what will happen if you stop taking a disease-modifying medication or any medication used for your MS. I can't fully answer that question since I am not a medical person, plus no two cases of MS are alike. What I can say is the various FDA approved medications help lessen the frequency and duration of an exacerbation. I suggest you speak to a qualified MS neurologist who is best able to explain why you should stay on a medication. Talk to them about any issues you have concerning your medication(s), explain your specific issues and needs and try to reach a mutually satisfying agreement on what course of action you should take. Good luck.
Best in health,