were you doing anything against the TOS? if not, then just be patient, it will probably be back tomorrow
it happends... you have to figure why it happened, resolve that issue and submit a reinclusion request. if you don't know why it did happen you might post here your URL and we will take a look...
I understand your plight but your argument or situation rests with "G"..Find out there reason and pursue it that way.. Best of luck to ya..
Wait a few days. I have heard that Google is reindexing. My site dropped from 150 to not in the top 600, but the it came back. It seems to be bouncing all over the place, so I would wait a few days before getting too nervous.