I have Meniere's Disease, and get really severe vertigo spells. It's an inner ear condition, and really limits the amount of caffine and alcohol I can consume. If I go through a period where I'm not resting enough (at least 8 hours a night of sleep) or eating well I'll have an episode that can flip my life upside down.
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“All his life he tried to be a good person. Many times, however, he failed.
For after all, he was only human. He wasn't a dog.”
― Charles M. Schultz
Warning: The above post may be dripping in sarcasm and full of smartassedness.