Who can tell me if I have possible ear damage?

Lately, there has been some sort of cold/flu virus going around and I finally caught it. It's not so much a flu or cold but more like mucus building up in my nose and throat. Its been almost two weeks and its not that bad, but I'm a bit scared about an issue going on with my left ear.

I've been blowing my nose and apparently must of blown to hard, that every time I blew, my ears would make a popping noise. Well, now I've noticed my ear feels like I'm in a tunnel or a slight feeling like you're under water. I can still hear, it just doesn't seem as clear as it does on my right. In a way I can feel the difference in my ears and I don't like the feeling of it. I put on my head phones and felt a slight pressure like I shouldn't have done that.

Anyhow, I'd like to know if doing all of this will cause permanent damage or if maybe my hearing will come back in a few days, like my ear just needs to pop on its on? Any great advice will be great, thank you.