Are you still having troubles logging in to your account?
If your email address is correct, it should remember your log ins. What you can do is log on to the website www.paypal.com so that you can check what is your confirmed and primary email address on the account.
To do this:
First, log in to www.paypal.com on a web browser > click settings or the cog wheel icon > from here. you'll be able to see your registered email address.