You clearly have a strong Inner Warrior. Gumption is a good thing, but so is gentleness and self-compassion (not to be confused with self-pity).
MS is a complicated dis-ease, and needs to be treated accordingly. It is hard, when you want so much to push through, to sit back and respect the flare ups. I would like to offer a possible tool to help. There are yoga techniques that can assist with the various aspects of MS. Google or youtube with the keywords Yoga for MS or some variation of that. As with all tools, examine carefully, and find what might work for you.
There are visualizations that can also be beneficial. This forum has an abundance of advice on this.
I am not a believer in 'pushing' through pain. Rather, I prefer the idea of working with the pain. Pushing can cause resistance, which can increase the tension.
There was a movie from the 80s called Gremlins. If you get the little beasties wet, they turn into evil demons. If you keep them dry, they are cuddly-sweet. I live in a visual internal-world, so this imagery work for me. My resistance is like putting water on them. My acceptance is keeping them safe and dry.
Emphasis on safe. Feeling safe is a large part of this battle we all wage.
Another tool is Self-Touch. Our bodies crave touch. It is part of our nature. Infants will die, or be stunted without touch. Quite simply ... we wither. Society has become no-touch. It is destroying us. The rise in pain-issues and emotional issues is growing exponentially.
When there is no one around to touch you, or you don't want anyone to touch you ... use your own hands and arms. Self hugs are nice. And our hands ... our hands are very powerful. Light touches, gently placed .. this can warm and soften our tensions.
Be strong - Yes.
Be self-compassionate - absolutely.
Welcome to the forum.
^_^