I can understand you're angry, but you can fairly easily restore your world, especially after the latest patch.

Try the solution shown in the link:
https://steamcommunity.com/app/892970/discussions/1/3431201423160378261/

Let me know if you need further assistance.

In any case: backing up your precious data is a MUST. Computers and the software they run can fail. Be prepared and you won't have to fear data loss.

External hard drives are cheap. Your data is priceless.