eBay review: I got ripped off on a fake paypal confirmation 3

I am a first time seller, I have bought tons of stuff off eBay, but I sold a watch, Rolex, for $1625.00, plus shipping. I sent an invoice, the buyer replied back, after sending the Invoice, she asked if I would please ship to her cousin, it is for him, for an extra $100.00, I said sure, well when I got the FAKE Pay Pal, it confirmed my money was there, to send my shipping tracking number, I sent the package, and now I am ### out of luck. They said it was a fake, but you cant tell a fake from the real, they claim there web site is secure, its not. The post office said they doubt I get my watch back, even thou it is insured, and the women, who was suppose to be from North Carolina, had me send it to Nigeria. I am out of my money and now, I am out of my watch too, plus money on trying to ship and trying to stop it. How is it, they are not responsible, i was selling the watch to pay for my dads funeral, and my child's funeral. I hope Dalinda Johnson, whoever she really is, rotts for this. How unfair.