My wife has relapsing remitting MS and manages it very effectively with this diet.
It’s not easy — cutting out lots of fats - but doing so has a really positive impact: reducing myelin damage, slowing progression and reducing relapses.
https://www.inverse.com/mind-body/diet-rich-in-beans-legumes...
It's very simple. Avoid foods that cause inflammation and this helps reduce MS flare-ups
I've avoided mentioning this too much in the comments because I didn't want to seem to be advertising this, although for full transparency, I feel that I must. It's just what I feel is the best best... I've also started (very) high-dose vitamin D, so-called "Coimbra protocol", which really needs doctor supervision which I don't currently have but will promptly.