A growing number of patients suffer from vertigo, an unsettling sense of one's environment spinning or moving.
Carol Taylor, 68, recalls the first time she had vertigo after a shopping excursion.
She had spent an entire Saturday shopping with friends, doing what they call "shop 'til you drop."
Which, she says, is exactly what she did when she got home.
"I found out later it was a vertigo attack," she says. "I went from an upright position to laying flat on the floor."
She was also sick to her stomach and extremely disoriented.