WordPress database lost

I updated WP on Thursday last week and made over 7 hours worth of changes to my website. Everything looked fine, and the update itself gave me no issues.

However; when I went to the website this morning, I noticed it has somehow reverted to the older version, not accepting any of the new changes I put it.

All of my newly created pages and menus are lost. The new plugins I’ve added and modified have all been lost.

Can someone please help?!