How to soothe septoplasty congestion? How long will it take, it's only been a day since my surgery.

It's day one of my septoplasty and I feel so miserable and congested. I've used nasal saline sprays but it feels like nothings changed, in fact I feel even more congested as time goes by. Why is that? Will I have to breathe with my mouth open until this congestion goes away? Why are my sinuses clogged?