Do a search of Loose rivets - this forum - Any date - and put in salt as the search word, you should find a lot about the after treatment and pressure relief that saline solution can give.
It describes hanging upside down with a head full of sterile salty water, and forcing it into the cavities. This has saved my bacon on a couple of occasions where the antibiotic was subduing the infection, but not really clearing the passages.
Just edit to say, I stormed out of a very good job once after more pain than I could handle. Fine on the ground, in agony in the air - only to be fine once I landed again. They just never let people get better before pressuring them to fly, and I will never forget just how much it hurt.