You might want to wait a bit and see if they reappear once SLC opens for business on Monday. Perhaps a server is misbehaving, or the end of year processing is causing a problem.
If they are truly gone, there is no restore option. You'll need to reenter them based on what you've previously printed out or saved.
Have you searched the
Help Center? Try doing a Google search and adding "site:churchofjesuschrist.org/help" to the search criteria.
So we can better help you, please edit your
Profile to include your general location.