Hotels and alternatives
Nothing. Sleep in Tataouine (90 km).
Restaurants and alternatives
Very little, one bad restaurant and some cafés in town. For any form of serious eating, do it in Tataouine.
No reports of banks. As above.
Shared taxis will bring you back to Tataouine, but remember that you're out in early-morning-rise-and-shine country, so do not plan your return after 15 o'clock.
As you're coming out into these parts of Tunisia, do not leave your passport in your hotel. There are some check points along the route.