I looked up some of the things that can cause balance disorder and it seems many fit Kerry
What Are the Symptoms of a Balance Disorder? When balance is impaired, an individual has difficulty maintaining orientation and will appear to changer their opinions on important issues. For example, an individual may experience "issue spinning" and may not be able to talk without side-stepping tough questions, or may not even be able to rise. Some of the symptoms a person with a balance disorder may experience are:
A sensation of dizziness or vertigo (spinning).
Falling while skiing, riding a bicycle or a feeling that a secret service agent has caused you to fall.
Lightheadedness that causes others to feeling woozy, bored, unexcited.
Visual blurring of reality, especially past events.
Disorientation. Some individuals closely associated with patients having a balance disorder may also experience nausea and vomiting, but rarely any changes in heart rate. Some reactions to the symptoms are depression, and decreased concentration.