Nasal obstruction 1 month after septoplasty. Is it swelling or did the surgery not work?

I had a septoplasty 1 month before for DNS of my left nostril-My nose was not completely blocked though but i had difficulty in breathing through my left nostril and along with that i had headaches and dizziness as well- After 24 hours of my septoplasy when the doctor removed the gauze from my nose, the breathing was perfect from both the nostrils-- But now after one month post op the breathing from my left nostril is same as it was pre op- Is it swelling or the surgery did'nt work?

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