I drink chamomile tea when I'm feeling nauseous. Not sure it actually helps... it's what my mom used to give us when we were sick so there's probably some psychological thing going on as well. But it is
supposed to have a calming/soothing effect. How about green tea? I've read it's supposed to help with some stomach issues. Though it seems that you were tested for all of those so that probably won't help...
Have you been tested at all? For your ears, that is. Is it possible that it's motion sickness? Poor eyesight might be a contributing factor?
I really don't know... just guessing here. I'm very sorry though. That has to be rough.