Back to sqaure one

Hi, I am very new to Blender, just downloaded it a couple weeks ago.
I was sculpting and then I went into object mode to add spheres for the eyes, when I did, all the work I did sculpting was gone, what was on the screen was the head when I started, ( a bunch of blocks in the shape of a head). When I went back into the edit mode it was still the same. ( Mr Block Head.)
All that work and now I am back to sqaure one.
What did I do wrong?:frowning:
Hope someone can help me with this.

Check the preview settings in your multiresolution modifier

Thanks for your help !!!:slight_smile: