CAN'T ACCESS MY YAHOOMAIL

I can't remember if I changed my password. However yahoomaol tells me that the password was changed a year ago. I tried all the possible passwords that I could be possibly using but it blocked me after few tries. On the security answers i could not answer simply cos I don't even remember that i put them at the first place. I did not think of any possible difficulties back then. I have it now for almost 20 years and all of my contacts are there and my e-mail is linked to my flickr and facebook accounts as well. I am desperate to get it back. Could I contact anyone to confirm that that is really me. What to do. Please, please someone help me.