Since going on oxygen this past Spring, I have been experiencing nasal irritation that results in sneezing and a very runny nose. My nighttime oxygen is through my CPAP machine which adds humidity. Prior to the oxygen prescription, I did have some dry mouth related to the CPAP but now the dry mouth is extreme and my nasal passages get sore which wakes me during the night. I am also finding it difficult to breathe through my nose during the day as it results in me sneezing even more. I have tried Saline spray, netti pot and naso gel to ease the irritation; all to no avail. I have not tried petroleum jelly yet but will. Does any one have any helpful advice on dealing with the issue?