Hi there! i agree with you over the fact that allergy is common to bangalore, however all attacks of cold/flu cannot be attributed to allergy. morever indiscriminate use of anti allergics is not advisable. what i have seen in general is intensive steam inhalation using capsules of karvol plus along with tab wikoryl will bring you good relief. to confirm an allergic etiology to your cold you should check your serum ig e levels. if elevated they need to be monitored and specific antigen needs to be isolated for long term precautions and benefits. i would also recommend you getting yourself evaluated for chronic sinusitis as this also contributes to chronic cough and cold in many cases. drink plenty of fluids and avoid using fan at night.