I took a walk in the park and my old account fell out of my pocket. Can someone help me finding it or creating a new one? I do not want to miss my questions and answers.
First up, try the account recovery page on the site you're trying to log back into - e.g. http://meta.stackexchange.com/users/account-recovery. You can find this through the "forgot password?" link from the login page.
If you can't recall the email you used, you're probably out of luck, but you can try reaching out to the team via the "contact" link at the bottom of any page.