Recovering from a corrupted project

Hi,

When I opened Unity Editor this evening, I saw that the changes I have been making in the last few hours were lost. The Editor shows the scene as it existed few hours back without any reference to my recent changes. However, when I check the files in Assets folder, they all seem to exist and with proper modified timestamps. So my guess is that the data is all there except perhaps for some top level project metadata file that might have got corrupted.

Is there any way to "regenerate" the project from the existing Assets and other files? I am using version 2019.2.12f1 on Linux.

Thanks in advance.
Raghu