So I've had ETD for about 7 months. My left ear was always worse and the only ear that had tinnitus. I started to feel better until I got a head cold around memorial day. Now my right ear is plugged and has a low humming sound. I'm scared because this was my good ear. The ENT said it could just be ETD because of the cold. He said he doesn't know if it's going to get better or not. What could be going on?