Clogged Ear Sensation After Rhinoplasty?

This is not a common occurence and is more likely related to oropahryngeal and nasopahryngeal swelling that occurs with surgery and sometimes is associated with intubation or laryngeal mask anesthesia.
It generally lasts no longer than 7-10 days and is sometimes treated with decongestants or steroid preparations if severe.
There is no definite way to prevent this.

The clogged ear sensation after a rhinoplasty or septoplasty is due to a temporary swelling in the back of the nose, which blocks the eustachian tube. This is normal and resolves in the first week or so after the rhinoplasty surgery.

This is normal and goes away in a week or two. If you are going to fly during this time use a decongestant nasal spray 10 minutes prior to descent.