dear user about your question i would like to tell you that these symptoms you mentioned refer mainly to have allergy that causing increase mucus production or viral infection causing common cold symptoms lead to consequences of nasal congestion or productive cough .........your feeling of these symptoms should not make you worry as it is common symptom of common cold or nasal allergy .....about treatment you can take prednisolone as it will help alot to improve cough symptoms and nasal congestion .......you should also drink alot of warm fluids that will make you better ......you should also have bed rest and no severe effort ......avoid smoking and avoid odours like perfume ....you can gargle your nose with saline as simply it helps to decontaminate your nose from secretions.. ......you can use saline nasal drops for relief of that.......some times we require nasal swab for investigation if symptoms get worse but now you not need that but till now you need not to do that........some times certain foods like fish and milk increase these symptoms ..if you noticed that you should avoid this food .........if bacterial infection suggested in some cases you can take amoxicillin or erythromycin as it is antibiotic has great role in treatment of bacterial infection ..........wish you health