Entire Project suddenly corrupted?

Started the unreal engine this morning without changing anything and my whole project is suddenly corrupted, none of my blueprints are working and I have errors of missing functions and objects everywhere without me changing anything, as I compiled it yesterday evening everything was working properly and suddenly nothing is working.
Before anyone asks, I saved everything and shut down my computer properly, my hard drive isnt the issue either so I dont know how the heck this could happen.
Anyone knows what the error could be?
EDIT: After a few hours and multiple restarts everything seems to be alright again apart from a few errors caused by me refreshing some of the nodes during the corrupted state.