Could this be signs of "sudden hearing loss"?

For the past eight years, I’ve had a problem with ear congestion, and 3 or 4 years ago I noticed my hearing was diminishing. And since last year, my ears have been faintly ringing. And now a few months ago, my entire left ear will go deaf while I’m in the shower, and I have to put pressure against my ear to regain my hearing. Is this normal when people have hearing loss? Could I be going deaf?