Missing Emails

Missing Emails

I have two email accounts, however the emails from my main account are missing. It seems as if all my data has been deleted and I am not able to retrieve anything. All my folders are empty, I am not able to receive mail and all my documents are gone. When I log its blank and where it has the storage information is shows This account (%NaN%) and for Allotted  (0 KB). Also when I try to check the unread messages it just says undefined. Please help as 
this is urgent. How do I get all of my emails back?