Hey there! I am very new to Sublime and coding in general, so keep that in mind with my descriptions and technical knowledge. Also, I apologize in advance for the novel but I’m trying to be as detailed as possible!
I have been using Sublime Text on my Mac for about 6 weeks while learning the basics of coding in a class. I have had no issues thus far. Yesterday, I was working on a style sheet (titled style.css) and checking out my changes in real time via web browser. I’ve always hit the save shortcut after every new word or line - I’m just nervous like that. Everything was working just fine and I had added several new sections of code that were new concepts to me, so I don’t remember them off the top of my head but had saved everything several times so wasn’t worried. I stopped working but kept Sublime open in my dock. A couple hours later I opened up the sublime window to keep working. My code all looked fine, and after I added a new line and hit save, there was an error saying that sublime couldn’t save. I tested out several lines and confirmed it wasn’t an issue with my code, Sublime wouldn’t save ANY changes. I wish I took a screenshot of the error message! Anyways I had saved my work from earlier so I didn’t think anything of just closing the window and re-opening my file from finder. When I re-opened the file, it was completely blank. All the code was gone. There were no recovered files. What the heck?! I restarted my computer thinking that might help and allow me to see recovered files, but when it restarted Sublime Text had dissapeared from my dock and my applications folder! I had to reinstall it. Another very weird and frustrating thing.
I tried googling around but couldn’t find anyone with my exact issue. My course instructors also don’t have much advice on recovering my pervious saved file. I am hoping that someone here might know a way… 
Thanks for you time!