Cough can be related to heart disease
if your husband had been having high BP and echocardiography
has revealed diastolic dysfunction
in your husband is not uncommon in patients with long standing chronic diseases and medication. Medicated stent has less chances of re occlusion in first six months. And none of the symptoms you have described point towards stent blockade. Doctors explain the difference between medicated and non medicated stent before implantation
and the final decision is usually left to the patient. I do not see why you can not have other baby. Do consult your cardiologist for a re-evaluation of your husband.