Hi muddy,
Sorry that this is happening to you.
Sometimes it is embarrassing, but at times like those, if the situation is appropriate, I find that just muttering "Stupid MS!" is enough to satisfy most onlookers. That relieves the embarrassment and usually cultivates some level of understanding from others.
It lets them know that the problem is not from alcohol consumption, which seems to be a common conclusion that some people jump to.
With love, Erika