Symptoms of hyperventitating are numbness in face, lips, hands, arms, fingers.
Chest tightness,
chest pain, lightheadedness, dizziness, feeling of suffocation, anxiety, panic and these are to name a few.
A good technique to use when this happens is to grab a brown paper bag and place over the nose and mouth and try to slow your breathing into it, this will help to return your blood chemistry to normal and stop all the nasty feelings.....