Facebook – How to deal with Facebook real name policy

I used to have a Facebook profile for my store. It had 3000 friends and still brings lots of visits to my web site.

Now, when I open my Facebook account, it asks for my real name and won't let me go further. I tried a couple of variants, without luck. It now says that I only have one try before locking my account.

How does Facebook know whether a name is real? Should I use my real name (noting that I already have another profile with that name)? A lot of people know the name of the shop, not mine, so I'd like to leave the old name, but I'm afraid my account would be locked if I do. Any suggestion?

Edit: I also have a fan page for the shop, but with only 300 friends (10%). If I really need to use the fan page, is there a way to transfer all existing information (photo albums, …)?