I've had a cold allergy for the past 4-5 years. Earlier either of my nostril used to get blocked during the raining and cold season. This year it has been bad. Either of the nostrils is blocked and have difficulty in breathing specially at night after 2 pm ..most of time I am awake. Morning i sneeze continuously for 10-15 times..and then a white color very sticky substance comes out.. when i do yoga and yoga then both the nostrils are open and i breathe easily.