It will go back to normal soon, that happened to me the other day when i was at a McFLY concert.... so it will be like that for a while but not temporary. It will probably only affect your hearing a liiiiiiiiiiiittle bit.
do not listen to your ipod too loud though, because that over time ruins your hearing. I saw a study on it, and mp3s, ipods etc are in the top 3 ways to most likely ruin your hearing.