Big mistake. Rather than create a new Apple ID, you should have changed the email address used for the Apple ID. You can't do that now because you are using the new address in the 2nd Apple ID.
Changing the email address you use for your Apple ID -
http://support.apple.com/kb/HT5621
iTunes/Mac App Store is licensed to the Apple ID that bought it and only that Apple ID can redownload or update the content. Apple will not combine Apple IDs and will not transfer content from one Apple ID to another Apple ID.
Late 2012 Mac mini, OS X El Capitan 10.11.1; Apple Watch, 38 mm silver AL, Watch OS 2.0.1; iPad Air 2 & iPhone 6+, iOS 9.1