I just went to the ENT for what I thought was fluid in my ear that wouldn't clear. After a CT for a lump she found under my ear, she discovered that I had a massive sinus infection in every sinus on the left side. There was no open space at all from front to back on my CT scan. I had no clue. Just thought my allergies were a little aggravated. I'm now on a high dose steroid taper and strong antibiotics for a month. I've suffered sinus issues all my life and thought I knew when I had one. Just goes to show that they can be hard to diagnose.