I went diving about 4 weeks ago for a week, on the last day I got the flu. After I recovered from the flu, I had a humming sound in my left ear. During the last dive I had slight trouble equalizing but I didn't have any pain or blood from my ear. In the last 3 weeks I have consulted three ENT doctors all which came up with pretty much nothing. Can anybody shed some light to my problem? The humming is low pitched and comes and goes from time to time, kinda sounds like there is water in my ear.