Since upgrading to Lion I can no longer mount my external hard drive

I backed up about 10 minutes before installing Lion when I was on Snow Leopard. I know my drive works fine and there are no issues with it.
However, when Lion was installed, I wanted to perform a Time Machine Backup, but it said my backup disk was unavailable. I checked in the Finder and it wasn't showing up in the side bar, even though it was connected to my Mac and the indicator light on the hard drive itself was flashing - suggesting drive activity. I can also hear the drive spinning.
I opened Disk Utility and the external hard drive appears in the side bar and it says 'WD My Passport 071A Media'. Underneath that is the 'Time Machine Backups' drive which is greyed out. I have tried right clicking on it and choosing Mount but it won't mount, and I have also tried Repair Disk which doesn't finish, but also doesn't report any errors either. If I run Verify Disk and Repair Disk on the 'WD My Passport 071A Media' drive (which is the same drive) it does not report any problems and says the drive is working fine.
I have tried updating the drive's firmware and using different ports but neither have worked. I have also tried rebooting my Mac.
I really need to use this drive to backup and I can't format it because I can't afford to lose any data on there. Could someone please give me some advice or tell me how to fix this? I would appreciate it so much.
Thanks,
Nathan

Nathan Miah wrote:
Is there absolutely anything else I could do to sort this such as phone Apple Support
If you want.
or maybe install Snow Leopard using the disc it came on with my Mac and just set it up from a Time Machine Backup on my external hard drive (since it works under SL)?
Did you install Lion on an empty partition, or did you upgrade Snow Leopard?  If you upgraded, I'd not recommend erasing it, since your backups are apparently gone.  It's doubtful Snow Leopard will recognize them. 
It's not just backups on the drive either, there are other important things on there, so why won't they show?
Mixing Time Machine backups and other data is not a good idea.  See #3 in Time Machine - Frequently Asked Questions.  It sounds like the whole disk is corrupted.
I just really don't understand how this happened. Could it not be an issue with WD because they haven't issued firmware to support Lion yet?
If this is a simple external HD, connected by USB or FireWire, no, unless you installed some of WD's software on it.  That shouldn't prevent it from being seen at all, but anything's possible.

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