I edited a form for 2 hours and It didnt save.. please help

Anyway to get the form back to what I did for 2 hours. I dont know why it didnt Autosave 

If you are looking to restore the form to its previous state, you can use the Revision History Tool.

How-to-View-Form-Revision-History

As for the changes in your form not being saved, can you try using a different browser or the incognito/private mode of your current browser to view the form?

You can also clear the cache of your browser — https://www.refreshyourcache.com/en/home/

If that will not still fix the issue you are having, please let us know and explain to us what changes are you trying to apply in your form that is not being saved