Thanks for replying but I'm more confused than ever!
Chrome is a web browser and, to the best of my knowledge, it can't be protected by a password. So perhaps you mean that you're using a Chromebook??? Even so, I can't see a direct connection between the password protection on a Chromebook and an email account anyway!
You say that you can't use your original email address but you've not told us where the problem occurs. Is it, perhaps, that you go to the Gmail website and find that your password no longer works or is it, again perhaps, that you're trying to use an email app (that's totally separate to your web browser) and it's refusing to connect???
Please tell us
(a) what type of device you're using. (A Windows PC or laptop? A Chromebook? An Apple Mac? An iPad or iPhone? An Android phone? Something else?) ;
(b) how you access your email on that device. (Through a web browser, such as Internet Explorer, Edge, Chrome, Firefox, Safari or Opera? Through an app or program on the device that you use only for email, such as Outlook Express, Thunderbird, the Windows 10 Mail app, the Gmail app on a phone, the native email app on a phone?) ;
(c) where things go wrong for you when you try to use your email account. (Is it that you're asked for a password that's not accepted or, for example, can you access your account but still not send/receive any email?)