Try using 3rd party utilities such as unformat,Uneraser ..
you may be able to recover some % of data depending on how
lucky you are on the day when you know that your day started
off with hard drive formatted..

But if you really want to get some data out of your
formatted hard drive.. better spend some money and get data
retrieved from Data Recovery Specialist... While they
wouldn't guarantee you 100% recovery .. but will do happily
for money..