All of my text is gone

I was working on editing some things in a document, porbably one the of the biggest and longest I’ve ever made. When I went to save it it said “saving failed”. I tried saving it again and the whole screen went black. I tried pressing Ctrl Alt Delete, but nothing happened. I shut off the computer and when I brought it back on the entire text document was blank. I had saved it millions of times before, but now it’s all gone. Is there any way I can recover it?

Did you make a backup? What programme were you using to write things in?