for future reference: never ever ever ever ever EVER click on the link in one of those emails no matter how shocking or real the contents may look.
close your browser, open another one and type the
www.paypal.com (or whatever service you're after - ebay, internet banking etc) address directly and log into your account as normal to check things out.
they're known as particularly nasty ways for identity theifs to "Phish" you - ie sends you to a fake site and steals your username and password when you type them to log in. The phishers can then go on to use that online ID for all kinds of reasons. If you've been tricked by one of them you should also immediately go back to the real site and cancel that particular account (or at least, change the password!), never mind the credit card.