too much mucus production

I have a deviated septum and I haven't had surgery yet but when I breathe normally, I hear a wheezing sound from my nose and my nose is constantly full of mucus and when I try to swallow, a lot of phlegm accumulates in my throat. This situation has ruined my psychology, my nose hurts from blowing my nose, not being able to breathe properly and wiping my nose. Has anyone experienced this? What changed after the surgery?