My mom had MS. My uncle, cousin and my sister have MS. They say it's not inherited... Yeah...
Anyway, my sister was diagnosed over 20 years ago. She had a lot of success with Weight Watchers and has kept the weight off for several years. She eats super healthy and exercises (she runs.) My cousin lost weight with WW too and is now eating gluten free and vegan. It seems to help her symptoms, I believe. Especially eating gluten free. That might be something to research.
You can lose the weight and a healthy lifestyle will help with the MS. Even though there isn't a cure yet, the meds keep getting better. My sister is nowhere near where our Mom was at her age. I guess what I'm saying is, there are things you can do that can stave off the progression somewhat.
Good luck!