Hey, everyone, thanks for taking the time out of your day to read this.

So, today I upgraded my iPod Touch from version 4.[something] to 5.1.1. I lost all my contacts, but that's not all that bad, and I have a few games that I really like, that are connected to my Game Centre. But, even though I've entered my Apple ID, it keeps telling me to create a new Game Centre account. When I enter my old username, g33k_x, it says that it's already been taken (by me, obviously).

Even when I click Sign In With Existing Account, it still tells me to choose a new username... is there any way to get my old one back? If not, will it delete all my progress in the games?