1. change your password right now
2. if you havent done #1 yet, do it NOW.
3. Call paypal and yoru bank tell them what happened.
4. Try to somehow reverse the payment. Or put a hold on it so that it is frozen, if he hasnt tried to take it out yet. It usually takes a few business days to take it out.
5. NEVER open any links from a paypal email. More then half of them are fake and brings you to a fake paypal site that ask for your username and password. When you enter it in, it emails it to them.
Hope you can get this straightened out.
Jeff