Can't log into cpanel since I changed my primary domain name. cpanel still tries to go to the previous domain that no longer exists

On the Account Management Page, I used the "change primary domain" button to change my primary domain name.  The change seemed to go very well; however, ever since then I haven't been able to log into cpanel.  It tries to go to the old domain name (which doesn't exist) and so can't get logged in.  I will be starting over completely if there is a simple way to just restart.