sadly..
it's hard getting back your account if you dont know the questions ...
maybe try contacting the yahhoo?
they might help you and ask questions
like when did you lose your password or when did you create the account..
sorry for the late reply i also try to earn tokens so yeah lol
i hope you actually got back your account though it feels bad losing one
happened to me many times
for example i lost 2 of my imvu accounts where i hard 50 euros inside worth of credits
and i couldnt get them back.
anyways hope you found it back
happy day