Maybe you could just explain that, due to your MS, the constant noise is making you sick. Maybe they'd tone it down a bit. Play on their sympathy.....not their intellect as obviously they don't have any of that!

Try not to get yourself all wound up. I know it's hard to do, especially if there is something going on that seems rude and unnecessary. Unfortunately, most folks don't look at their own behavior as being intrusive and obnoxious. They have the attitude that as long as they enjoy it then everyone else must, too.