I am sorry to hear that you lost several month of data. When this happened to me, it was "only" a few days which already felt horrible...
You wrote in "my" thread that the "exact same thing" happened to you. But there is a small difference: When my note reverted back to an old state, it even showed the old date, so I knew exactly how much of my work was lost.
This doesn't really help you, I just wanted to point out that Evernote seems to have several different problems here
Good luck with the support! I hope we can get our notes back.