Ear pain is not associated with SD. SD is a neurological movement disorder that involves the brain's control of the vocal cords.

Unfortunately having SD doesn't protect us from developing other unrelated conditions and I would be 99% sure there is no connection whatsoever. Just because you have more than one condition at the same time doesn't mean they are related.

I had a persistent ear/sinus infection for several weeks last year that developed out of a bad cold. I needed pretty strong antibiotics to get rid of it. The first one I took wasn't powerful enough to deal with it. At one stage I even needed a sinus scan to check out what was going on, and to rule out naso-pharygeal cancer because only one ear was involved. At this stage of the infection I was seeing my SD otolarngologist and he never raised the possibility of a connection between the ear pain and my SD, and I'm sure there was no connection.

Good luck, and see your doctor - quickly if you have to fly, because you might need to try more than one med in an attempt to get rid of it.