I synced my Anki deck and everything is gone

I synced my Anki decks and everything is gone. I had just finished an Anki deck 5 minutes before syncing with 498 flashcards and they are all gone. What do I do? I need them for the test on Monday and I do not have the energy nor time to restart.

If you mean the cards are still there (you can see them with the browser), but you can’t review them, check this:

If the cards are really gone (you can’t see them with the browser), then you should be able to recover them by restoring an automatic backup: