My main catalog wont open. Spinning wheel. Please help!

All of a sudden my main Lightroom Classic catalog wont open. Other catalogs of mine open just fine. This on brings up the Lightroom loading screen and my cursor turns into the spinning wheel and never stops. When I right click the lightroom icon in my dock, it says application not responding. 

I read about the Lrcat.lock file trick, which I tried but it doesnt work. I delete it, try to open lightroom, spinning wheel appears and the .lock file appears again. 

This catalog has some recent work in it that hasnt been backed up and I need access. 

Any pointers?

[moved from bugs to discussions according to the community rules - Mod.]