Corrupt catalog , repair doesn't work

Please help me I have a corrupt catalog with so many hours of work done today that I can't repair. Lightroom experienced another error prior to this, I don't remember the error where a file was missing, but the solution suggested by LR was apparently to try and repair and update the app. I was able to normally open LR after the update and repair. Then I closed Lightroom down and restarted my computer and all of a sudden when I tried to get back into the catalog it was corrupt and the repair didn't help. Can someone from Adobe please help me!