My left ear has been clogged shut since April. CT and MRI show no abnormalities. Last month ear finally opened a few times. First time lasted barely a minute. Second time lasted a few hours. And third time lasted 2 days. Now it has been clogged shut for over a week again. While ear is clogged I hear the sound of silence very high pitched. Right before it opens, I hear very loud crackling noises. Hearing test done last month showed nerve damage and deafness. How is this possible if ear opened a few times afterwards, and I could hear perfectly? And why is ear constantly feeling full/ clogged ?