Hi.. These are allergic symptoms.. The best method of preventing these episodes are by avoiding the allergens.. Measures such as keeping nose and mouth closed using the mask or cloth when entering the dusty rooms, regular cleaning of the room, washing the bedsheets and pillow covers, keeping the curtains closed and so on is essential.. Severe symptoms can be controlled by use of antiallergic medications.. If these symptoms are very frequent, you can consider desensitization methods..