False alarm

If anyone can help me correct my writing I would appreciate your help.
False alarm
This morning I arrived at my office and turned on the computer as usual. When I was preparing to start my work, I suddenly found the folder containing all my work of the past 8 years had disappeared. Oh my god, I felt my mind go blank, but I tried to calm down and recall what happened. It may have been deleted by a virus, I thought. Then I tried to figure out how to get my files back. If they really were lost forever, it would be a disaster for me. Fortunately, I found it in another folder. I thought maybe I had moved it to this folder by accident. It was a false alarm, but I drew a valuable lesson from this. I copied all my works into another hard disk so that I would never have a scare like this again.