Account Scammed

hi my main account with a LT. rank, got scammed (this month). Someone tricked me into giving him my ID n Password , security answer. i know this was stupid of me, but now i need help. He changed my password, and email. so i cant do anything about it.
i lost my registered email (this suckz). now i cant give the register date and the copy of email. The only thing i got is ID, security answer.
i have a email from Z8, in my new email address, as one time i tried to change my email. but i dont know how to make a copy of that Inbox file from yahoo and show it to a GM or someone else.
tell me how should i report this now.
I am hopeless, any help would mean a sign of faint light in the darkness. thank you.
P.S-- PM me, or whatever help.