Well, first off, I don't know if anyone's reading this, so I don't know if I'm helping anyone but myself here.
But I found something out while painting today. When I use a regular brush my right hand starts to go numb. Maybe it's the MS, maybe it's carpal tunnel... who knows. But I found out that when I use the cheap, sponge, disposable brush I don't have the numbness.
They have a round handle and it's smaller, so maybe that's it. Who knows. Just thought this would be a helpful tip for anyone who's experienced the numbness while painting.