It was from godaddy where your site was nominated. It will be OK after some times if you take care your sites keyword and content refreshment. Once Google crawler visits your site will update again.
Maybe you should consider registering it for a couple of years more , an important domain should never be expired.At least set it to autorenew.
dont worry your rankings will be back with in two weeks. by the way get some new links pointing to your inner pages.
If you have still the same content, you site will definitely get its ranking back...dont worry... --Ashish