Calling SE is your best plan. In the meantime, do a virus check on your PC and try and find whatever nastyness is on there, and get rid of it . Take steps to protect your PC in the future also (adblock and noscript for example, if you're on firefox)
Hope you're lucky in getting your account back, theres a post somewhere that details some of the virus thingys responsible for the hackings, I'll see if I can find it for you. ^^ Found It!
Read the whole thread, not just the OP, as I'm not sure how often the OP is updated ^^ Hope this helps :) Edited, Sep 12th 2008 5:26pm by fatalillusiontw