1 year on from septoplasty and turbinate reduction, constant sinus pressure, headaches and blocked nose. Has the surgery failed?

Hi, I had the procedure a year ago and recovered well. While I still experienced allergies, the pressure and blocked up sensation seemed to be relieved. Over the past 2-3 months, the symptoms have returned. I have constant sinus headaches and a blocked solid (yet runny!) nose. I'm breathing through my mouth a lot and even feeling like I'm not getting enough air. The greatest pressure feels very high up in my nose by eyes. Has the surgery failed or could this be due to my allergies?