Just because you've recieved spoof emails does not mean your account has been hijacked. We all get them. I don't even send them to Ebay anymore, I doubt they do anything about them.
The ones that appear in my ISP I mark as spam.
Are there any listings on your account that aren't yours?? If there are, pls post back and let us know.
Shadeaux is right tho, go to Ebay Live Help to double check for sure.