Everyone is assuming you will be fired. My first question is have you committed expense fraud or call fraud? If so, I highly recommend Short term disability. Get to a doc by tuesday and have him give you an excuse to go on medical leave. You simply call HR and tell them your going on short term disability. They will request a note from your doctor and then will turn you over to short term disability.This will buy you 3 months and then they can cut you loose. But in the meanwhile you collect pay. Its better than a swift kick out the door.
Or you can just roll over and play dead. Good luck!