** Thanks for contacting HCM with your health concern. 1. as there is history of allergy thus it could be an attack of acute on chronic Bronchitis i.e. chronic obstructive pulmonary disease [COPD] 2. It will be wise to consult a Chest specialist to get blood investigations and chest X-ray done for proper line of treatment, in the mean time: - stay well hydrated to keep mucus thin - chest physiotherapy which produces vibration in the chest to help mucus move along the bronchial tubes - . Increase your fluid intake (warm water with lemon juice and honey) and avoid cold and constipating food (dairy products,sugar,wheat - take diet rich in sulphur (garlic,onion) which helps in relieving congestion and increase intake of herbal tea (Lime,ginger,Fenugreek) - Ayurveda Jal neti is effective in such conditions. - Vitamin C rich diet is beneficial to increase the immunity.