The swelling in and around the nose and the visual changes on a day-to-day basis, have to do with fluid retention in the nasal tip. Surgery will not correct this and will only make it worse. Make sure that you are on a low salt diet and that allergies are under control. You do not need a revision rhinoplasty.
Tara,It is not likely that you still have swelling 20 years following Rhinoplasty surgery. You may have sinus problems and you should see an otolaryngologist or plastic surgeon for an evaluation. Good luck!