I have been diagnosed as having Meniere's Disease. I have learned that for me, a sharp piercing noise then hearing loss in the same ear precedes an episode. I'm fine that day, but the next morning I have pressure in my sinuses, and dizziness/lightheaded/nausea. Thankfully, the episode is resolved in 12-24 hours, then I'm fine again. I've also noticed that for me, a change in the weather will trigger an episode. I'm usually fine going from wet to dry, but dry to wet isn't so good for me.