Audio files recorded into timeline missing

Hello, I have been editing a documentary on and off for the past year. Last march, I booked a recording studio and recorded a majority of the voiceover directly into the timeline of my project. I have been working on the project in chunks, and I finished a chapter today. When I returned to my voiceover sequence, I learned that the main file had gone offline, and that the individual chunks of audio I had been using seemed  to have been cached by premiere. I regularly go through files on my computer to clear program caches, because editing takes up a lot of space and disc power, and fear that I may have accidentally done away with my voiceover. I was wondering if someone with more insight into premiere pro’s file management can give me insight into what may have happened here, and if this information is at all recoverable… It will be another expense and lots of lost time to rerecord this file!! Thank you..