credit card stolen, what should i do?

[72ratnova]

so tonight i come home from spending time with the family and check my e-mail and see a paypal receipt for paypal payment when i havent brought anything in over a week and it says a $500 camera was bought today on ebay with my paypal. i have the persons name and address where it is supposed to be shipped to and its out of state. so already ive filed a claim with paypal and they are investigating the order and i was able to get a hold of the last person working at discovercard tonight and they canceled the payment and the cerdit card number so it cant happen again. then i emailed the seller of the camera and told him the whole deal and theres no point in shipping it because there will be no payment. but after doing more looking there was another purchase of $300 on the card thats not ours, but they already left at discover so have to wait til monday on that one. and i already changed my paypal password. is there anything else i can do to stop this from happing again?