These sound like the characteristics of anxiety disorders. A sudden and unpredictable episode of distress is more commonly referred to as a panic attack.
panic disorders
The medical term for a group of neurologic disorders characterized by recurrent episodes of seizures is epilepsy.
Epilepsy
The common term for these disorders is epilepsy. One person in history that is said to be affected by seizures is the Roman Emperor Caesar.
An episode refers to a specific occurrence or manifestation of symptoms, such as a depressive episode in depression. A disorder is a broader term that refers to a pattern of symptoms and behaviors that cause distress or impairment in functioning, such as major depressive disorder. In other words, an episode is a single event within a disorder.
Um, May is a coordinator with a Combusken. When ISN'T she in distress? (jk. She's usually in distress whenever Teams Rocket, Magma, or Aqua are around.)
Anorexia is characterized by extremely restircting food / calorie intake and an excess of exercise. Bulimia is characterized by episodes of bingeing and purging.
Epilepsy
Bipolar I disorder is characterized by manic episodes, the "high" of the manic-depressive cycle.
Alternating hemiplegia is a very rare condition characterized by recurrent episodes of temporary paralysis.
Asthma
During episodes of respiratory distress, the skin may appear to "dip" down in between or inder bony structures, such as the ribs.