Music only plays in one ear, ipod nano 5th generation

My ipod nano 5th gen had been acting up since january, the sound would be popping on and off in one ear but the other would be fine. I thought it was the earphones so I kept buying new ones, but still it didn't change much, so then around march, it finally just stop playing in one ear. I'm pretty sure that there's a problem with my headphone jack, and I can see that inside, you know the two bumps, the top one is kind of inside my ipod. I don't really know what to do! Help me, please!