Hello You didn t the duration of these symptoms as diagnosis of many disease depend upon this. But you mentioned that there is severe cough with congestion , may be due to these reasons , these are: 1 Allergic bronchitis , diagnosis can be confirmed by physical examination by a physician . 2 Allergic rhinitis , sometimes due to allergy in nose is one such cause . 3 If the duration is for prolong period( 25 days ) the reason of such cough and congestion may be tuberculosis . Diagnosis can be confirmed by X ray chest . I advise my patient to take montelukast+levoceterizine , one tablet , once in day , if period of cough is not more than 3-5 days . Also take some dextromethophan cough syrup. If no relief within 3-5 days consult a physician and get his opinion.