As everything with EM, each patient is totally different but I’ll share my experience.
I recently had a relapse, my left leg and arm felt numb and weak for 2 days so I went to the hospital. After I came out of the hospital where I was given 5 infusions of corticoids in 5 days, I could just walk for 15 minutes without feeling tired in my left leg, when I was a runner as hobby before. But I kept doing it every day, increasing a few minutes more per session. Then I started to get stronger and stronger and to alternate running and walking and 5 weeks later I’m again running 5km and hope will run 10k soon again.
So yes, you can recover, keep trying even if you think you won’t, don’t lose the hope.