Can anyone help me? I am an Imac moron

Ok here is my problem. This morning I changed my login username. In order to do that it asked that I change my password so I did that. I then logged out. After I logged in with the new password everything from my old login name was wiped out. No emails, no nothing. All my songs on itunes are gone, all my bookmarks etc... I figured I created another account. I searched for my original account but cant find anything.

Does anyone know what in the world I did and how to get back to my original login administration account?

Any help would be greatly appreciated.

I found an alias library in the network section. It gives me three options. It says the alias library could not be opened because the original item cannot be found.

The 3 options are delete alias, fix alias or ok.

I'm lost. LOL

In my users folder I have a deleted folder which has nothing in it a shared folder and a house with my original username but when I click on the house it is not my original file.

No I did not see any old files whatsoever in spotlight.