FrJack
My husband had the same problem that you are experiencing. 4 years ago we went to see an Ear, Nose and Throat specialist, the whole right side of the nasal passage was blocked.
My husband had been using Sudafed daily for many years as this is what brought temporary relief.
The ENT did the surgery and my husband has been able to breath freely for 4 years now.
He wished he would have done the surgery sooner.
Hope this helps.
Take care

#1Texan