Well...if your password is cached in your browser, you could try logging out & then copying the cached password on the login form. If that works, I serious recommend that you paste it into a Notepad, print out the pasword immediately, and then delete the Notepad. Don't save your password on your disk!
Unfortunately, if that trick doesn't work... you're screwed :(
how do I check in the browser?
http://fieldguide.gizmodo.com/how-to-find-long-last-passwords-hiding-in-your-browser-1638976827