App Crashed in Companion --- Deleted ALL blocks in designer

Well my presentation is tomorrow and my inventor companion app just crashed while resizing a subobject and DELETED all of my blocks. I have a back up from yesterday but I have done substantial work since then. Is there anyway to recover?

Well Very Strange, Closed website and reopened, all objects back ... Needed a heartattack today

Did you download your AIA file before? If you did, you can import it back to App Inventor and work on the latest updates.

If you didn't, check if you closed that browser tab or not. If you did not, right-click on an empty space of the Blocks workplane and select Undo.