Hello I had gone through your question and i can understand your concern Looking at your history chest could for a month could be related to any of following chest infection due to bacteria viral or mycoplasma tuberculosis allergic reaction COPD asthma I would advise you to visit a chest physician for clinical examination and battery of tests like CBC ESR sputum test and an X ray chest meanwhile you can take decongestant like levocetirizine or montelukast and a cough syrup for symptomatic relief do wrm saline gargles Steam inhalation cough lozenges deep breathing exercises hope this help you good luck