How long does it take to cold/flu like symptoms to disappear? Post Septoplasty in right nostril and left concha bullosa surgery

I had a septoplasty in right nostril and left concha bullosa surgery on May 5th '16. I did not have any splints and instead had a nose pack for a 5 days. I had to travel (20 hour flight) for work 3 weeks after my surgery and i still have cold,swelling and tip of my nose still hurts. My nose gets congested every 2-3 days and have diffulty breathing with my nose. I also noticed traces of blood in mucus since last 2 days. Is this normal? How long does it take to cold/flu like symptoms to disappear?