ITunes access problem after iOS5 upgrade

Question

I just finished upgrading my iPhone 4 to IOS5.  Problem: my iTunes ID is embedded and I'm only prompted to enter my password.  My iTunes ID is not an email address and I can no longer access my account.  How can I change my ID in my phone?

Answer 1

Went down to the local Apple store and resolved my issues.  I was told that they had never had anyone come in with the nickname issue before.
The fix:
DJ had me go to the iforgot.apple.com page (a very familiar page by this point).  Under the box where you would enter your Apple ID, there is a link "Forgot Your Apple ID?".  He had me click on it.
On the next screen, he had me enter my first name, last name and the email address that I thought was associated with my iTunes account.  You can enter several different email addresses, just in case you had several different email addresses that could have been used when you established your Apple ID.  I then clicked on 'Next'
On the next screen, I opted for the 'Answer Security Questions'  Authentication Method.
Answering the required questions allowed me to then enter my email address as my Apple ID and the new password that I had chosen. 
After doing so, everything was as it should be!  I was able to update my apps that needed updating...AND... my $21.34 credit was back!  Thank you DJ at the Roseville, CA Apple store!