I’ve noticed that I find walking much harder after eating with my legs feeling and acting like lead. I’ve put it down to my body concentrating on digesting so it doesn’t have spare energy / function for walking. I now try to factor In digestion time before I do any walking about.

Are your immunoglobulin levels ok? Sometimes if they are low you can get a variety of symptoms including diarrhea. Mine were quite low once (also on Ocrevus)and this happened to me, they've since bounced back and all fine now. If diarrhea is ongoing it can throw your electrolytes and potassium levels out of whack too which can make you feel wobbly. I would mention this to your m.s nurse or consultant so they can double check levels for you. Best wishes