well, I broke my nose very badly (someone dived into my face in a pool) - bone fractured out of my nose. They were picking out bone fragments off my cheeks - seriously unpleasant (owww). Now am proud owner of an 8 stitch scar right down the middle of my nose!
They operated to try and straighten/reset the septum and sort out the other bits (had trouble with sinuses before the accident).
Op wasn't 100% successful - I bled loads and they didn't manage to fully straighten my septum.
Sinuses felt great for a bit afterwards - it totally cleared them out but then, they started getting infected again. I did see an ENT and he gave me a very strong spray which meant I didn't get sinusitis for a year - it was AMAZING.
He said that basically, my sinuses were getting irritated by allergies and swelling up thus making them susceptible to infection. He sorted out the inflammation and I stopped getting the infections.
However, I don't think I'll ever be fully sorted cos the inside of my nose is too buggered.
Not long till your ENT appointment - fingers crossed he/she is a good one and can sort you out!