Had a similar problem (you can see my original question here), so I’ll see if my solution won’t work for you. Quick question, though- are you getting any error in the crash report? Access violation, etc? Mentioning that in your question would have been helpful, though I understand the panic of not even being able to open your project.
Anyway, try this:
Clone your project. Try opening the cloned version and see if it compiles alright.
If everything compiles and the editor starts, then it’s likely the same weird problem with your old project that I was having. I never figured how to fix it, so I instead just recommend deleting the old version after you’ve verified your new cloned version has everything and is in working order…