I feel so violated.

[marsupial]

So my credit card was denied at Walmart today. I called my credit card company thinking perhaps it had something to do with an online purchase I made last night and that all I would have to do was verify the purchase and my account would work again. No, it was because of some purchase made in Italy, another in London and a few on Napster. None of these were mine. So I had to close the account and file a fraud claim. I have no clue who has my card number or how they got it and I am wondering what else I should be doing to protect myself? Could this person have other information about me or have access to my other accounts? Would I be better off without a credit card altogether?

Do any of you have experience with this situation and advice you can offer me?

Thanks!