My External Hard Drive is NOT opening!!!

I have an external hard drive (my book) by WD.... When I plugged it in today it did not open and reported this error:
Catalog file entry not found for extent
The volume could not be verified completely
ERROR: This disk needs to be repaired. Click Repair disk.
My question is if I hit repair will I loose all my files????? UGH
PLEASE HELP... I need these files!!
Thank You!

ok now it says
ERROR: DISK UTILITY can't repair this disk. Backup as many of your files as possible, reformat the disk, and restore your backed- up files.
What the heck do I do now??????
SCARY!
Bree

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