Such a question would be directed to support. You can find the link in my signature.
Let them know everything you may find relevant, character names on the account, where you played from, what email address is on the account, etc. They will ask you if they need anymore information and then go from there and hopefully get your account recovered.
I let them know one of the character names, an estimated amount of money he had on the account, that he had a mount etc. Also the ISP I used to register etc. How long would it take for a reply? I really don't want to start all over.