Lost all Control files (Want to Recover)

Hi
I have a database in archive log mode and we take a rman hot backup everyday. We are not using the recovery catalog. I lost all the control files
few days ago. I have a control file to trace and that was generated 20 days ago. This is our test database. I want to recover it. I don't know if we have
done any physical changes or not after the creation of this text file to create a control file. Database is still up and running.
Any help will be appreciated?
Thanks in Advance

If the control is restored from the rman backup lets say it is 3 days old, then how to update the same control file with the current database statistics.
--Luckys.                                                                                                                                                                                                                                                                                                                                           

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