hi there, your symptoms are suggestive of constrictive lung disease. You will need to get an x-ray chest done to rule out any lower lung pathology as you have a longstanding history of cough and congestion. Secondly you should get a pulmonary function test done to know the level or obstructive disease if any and take treatment accordingly. If you have a history of asthama than tht also needs to be investigated for further management. In the meanwhile try taking some steam inhalations and decongestants to give you symptomatic relief Some physiotherapy for expectoration of cough will also be helpful. Take care.