I used to be an overture advertiser. I can't remember my username to log into the new yahoo!?

It says on the page when logging in, if you can't remember your pword to type in your username/email addy. Well I know which email I used to sign up, but I can't remember my username! I really would like to utilize the new yahoo search advertising but I can't unless I can't get into my account. I don't want to resubmit all of my ads and start from scratch and resign up. I just want to log in to my old account like I did for 3 years now. I just haven't logged in lately and couldn't remember my username. HELP! I really would like to start advertising again. My budget is ready :-)