That sucks!
Paypal sucks, I wish you luck! I have had to dispute 2 paypal payments from eBay purchases, where the seller robbed me(i sent payment they didn’t send product). I know its different, but paypal was very little help, I could never get a real person to talk to. I have never been compensated for my loss (received small partial payments)
I also once had my bank account drained of a few thousand through a Venezuelan cash machine. My bank covered the loss the same day, I filled out 20-30 forms (one for each transaction) and signed an affidavit that I hadn’t left the country in 90 days.
I hope you get all your money back!
Also do not just change your passwords, make them hard! Use no less then 8 characters. Use a special symbol (ie:!,@,#,$,%,etc.). Use at least 1 capital letter 1 lowercase letter and 1 number. Do not use words that you can find in a dictionary, or names (including pets names). If you follow these rule you will have a very safe password (just don’t tell anyone, or use it in more then one place!).