That you've forgotten some of your login details or you no longer have access to your original email account are merely stumbling blocks, not show stoppers.
Please contact me via
http://dmoz.org/cgi-bin/send.cgi?toeditor=mollybdenum with as much corroborative information as you can such as:-
Approximate date joined
Real name
Editor name (but not password)
Original email address
Joining category
Additional categories gained
Roughly how many edits done
Approximate date of leaving and the circumstances