Hello
I understand your concern.
Breathing difficulty,anxiety are part of
panic attack.
One attack may make a person more prone to further attacks.It is necessary to take care of the matter by visiting to a
psychiatrist.
It will first be needed to evaluate and rule out other causes of breathing difficulty through medical history and certain investigations.
Psychiatrist then may prescribe with certain medications including
anti depressant and anti anxiety medicines.
Psychotherapy and behavioural therapy will be required to make the person tolerant enough to handle stressful situations in life.
What you can take care of is,
-Sit down with your wife,understand her,discuss the problems with her,look for what she needs.
-Tel her practice yoga,
meditation and breathing exercises regulary to destress her mind,
-Avoid alcohol and caffeine which are associated with exaggerating the symptoms.Taking healthy diet and adequate fluids for general well being.
Hope this information helps.
wish your wife good health.