Is there anyway to retrain your breathing? if your lungs are used to chronic hyperventilation is there anyway to reverse this?

Long exhale; breathi: Inhalation - breathing in - is automatic and natural - take a few minutes during the day to do extended exhalation - that is breathing out and even when you have breathed out all the air you think you have continuing to breath out as hard as you can. In addition breathing in with the belly every time you think about it - that is when you breathe in the belly ought to be going out.

Not really: Hyperventilation is either a physiological response to co2 or o2 levels in your blood sensed by the chemoreceptors in your brain or from an anxiety provoking mechanism (panic attack). So either you retain co2 due to copd/emphysema or you have high levels of Adrenalin from anxiety that stimulate hyperventilation. If the hyperventilation is from the latter you may try relaxation techniques.