So after figuring out how to get my old editor back after updating to Wordpress 5 I have endless problems this week with my pages being broken. Each time I managed to get my pages back for a little while after fiddling with things and next day my pages were gone again just for me to repeat the same and get them back.
Finally I found a way to fix this although it won't be a permanent fix it is working for now and I have my pages. Follow the video to see how to downgrade your version of Wordpress.
Related training: Wordpress 5 Classic Editor Plugin
If you have any questions please pop them in the comments below :)