Ummm... I got slapped on my ear and at that time, it hurt a lot... later that night, as usual I listen to songs on my iPod using earphones, when I plugged an earphone into my ear, I was able to listen but not like that I used to before?? Will my ear heal? It seems not like the other one? What to do?

We can't know if your membrane will heal on it's own or if it was severely damaged. Arrange to see a doctor (ENT preferably) in 4 or 5 days, if not.

Why haven't you been to a doctor yet? Is your hearing not that important to you?