What do I do when my septoplasty failed?

I got a septoplasty back in June. Doctors said it was successful and that I should be able to breath normally. It went well weeks post-op but then I got what I thought was a cold. And I haven’t been breathing normally since. I noticed my left nostril was smaller than my right. And now looking it at it is completely blocked by the septum. So my septoplasty not only failed but also made it worse. I REALLY would rather not go through the surgery again, especially after it failed. What do I do?