Hi
Not much can be done at this point of time but thought it might help you a bit.
You should check integrity of your database on regular interval of time so that measures can be taken to minimize the data losses. If you wish to know how to do that check the below link:
http://technet.microsoft.com/en-us/library/ms176064.aspx
Maintain regular backup so that if you find any database inconsistency of corruption you will be able to perform repair and restore process easily. Check out how you will be able to do that:
http://technet.microsoft.com/en-us/library/ms187510.aspx
If you are not much aware of the recovery process and still needs to perform recovery on MDF or BAK files then I suggest you to check go through these Wikihow Pages to understand better how you will be able to do that by using specialized recovery software.
http://www.wikihow.com/Perform-MS-SQL-Database-Recovery-Through-Software
http://www.wikihow.com/Repair-MS-SQL-Server-Backup-%28.Bak%29-Files-with-the-Help-of-SQL-Backup-Recovery-Software
Go and check if these solutions help you in your cause.
Regards