2 Gmail Accounts Have Same Username.

How do I separate my gmail accounts with the same username.  I originally had a google blog with a gmail login.  no porblems accessing to moderate.  Then a few months I finally figured out how to access the second gmail account after changing the username and pw.  But now I can't access my blog.  When I tried gmail recovery on my blog it gives me the same username as the second gmail account.  I can't access my blog.  I need help to separate both accounts with separate usernames.