Thank you for your query at DoctorSpring.com
The spirometry reveals very severe air way obstruction with mom significant reversibility.
It may not be limiting your physical activity as currently you are only 58, and heart is compensating for the lung weakness. Also during exercise there is adrenalin surge which also increases your. It also increases your lung capacity similar to the extend of a nebulised bronchodilator.
The cough that you are currently experiencing is body's protective mechanism to expel sputum and to increase the fev1.
Suggest to quit smoking and do take inhaled drugs that doctor may suggest.
Dr. Jacob George P
MD IDCCM FCCP