Hi and thanks for the query,
One of the reasons for longstanding stuffiness of the nose is allergy
all drain into the nose. When you blow your nose with a lot of force pressure changes occur within the sinuses leading to pain that you have been experiencing.
And about the popping of the ear. a tube called the eustachian tube connects the nose to the ear. Whenever you swallow the tube opens and air flows into the ear producing the popping. It indicates that the tube is not working efficiently. It is commonly seen in allergies of the nose.
Get your doctor to rule out allergies of the nose.
Regards, Dr Kishori.