Welcome Im Cory. I will be helping you today.
I am sorry you have deleted your email by mistake but i will help you to try to recover it.
First you will want to look in your deleted folder and if they are in there then you are able to check the box next to the emails and you will be able to move them back to your inbox.
However, if they are not in your deleted folder then you will have to fill out the email recovery form so Yahoo can try to recover the emails from the server.
Click http://help.yahoo.com/l/us/yahoo/mail/yahoomail/mail_restore.html to fill out the form to have Yahoo Restore your email.
Since it has been sooner than 24 hours you have a higher chance of them being recovered.
If you have any questions please click, "reply to expert".
It was my pleasure helping you today!
Please bookmark this page so you can return to it later.
You can come back to this page at anytime to followup with this question.
It's been a pleasure helping you further!