Lightroom Catalogue Issues

Hi Everyone,

I have been suffering multiple issues with Lightroom and really appreciate the help of people on here with my previous problem, but sadly it persists.

I believe some of the issues were caused by an issue with iCloud which moved a number of files and confused LR. However, the recent problem is pressing as it involves work due to be delivered to a client.

I was finishing the album with little issue, I saved it and went to bed. Got up the next morning to add a few more images they'd decided they wanted and LR wouldn't open. I searched the forum and found what I believed to be the solution, which told me to reset preferences.

I did this and then when I reloaded, my catalogue was gone and I have a new catalogue that is blank and starts as if it's the first time after installation (with on screen instructions etc).

Now, I have tried to reload my previous catalogue and it will not load, it just spins with the loading symbol and doesn't even open. 

Even attempting to download my presets to the new blank catalogue wont work as it says they have already been imported.

Any help would be so greatly appreciated.

Macbook Pro 2017, Dual-core i5, 8GB

Thanks in advance