I received the following email:
Sign-In ID Change
This e-mail confirms that the sign-in ID (E-mail Address) for your Sony Entertainment Network account has been changed.
If you did not intend to change your sign-in ID, please contact Customer Service using the link provided below.
http://sonyentertainmentnetwork.com/support
Thank you,
The Sony Entertainment Network Team
This e-mail message has been delivered from a send-only address. Please do not reply to this message. For more information about your Sony Entertainment Network Account, please visit the links below.
Support:
http://www.sonyentertainmentnetwork.com/support/
Terms of Use and Privacy Policy:
http://www.sonyentertainmentnetwork.com/legal/
"Sony Entertainment Network" and "Sony Entertainment Network Logo" are trademarks of Sony Corporation.
I DID NOT change my username. I am unable to recover it through password recovery. My account was possibly hacked.