Audio Files Disappeared

I'm working on publishing my first course using the Articulate suite, and after spending hours working on my narration, my files disappeared today. They are ALL GONE. I'm freaking out.

I recorded all of my narration on Friday, saved and previewed everything. The entire file was working perfectly this morning when I opened up the audio editor. I went through the audio for every slide and silenced some breaths, took out a few pauses, etc. Again, I saved and all of my audio was working perfectly. I then went through every slide and synched my animations to my audio, saved, and every slide was working just fine.

My last step was to record audio for my engage interactions. I recorded the audio, previewed, and the audio for those pieces worked fine. That audio is still there. My instructor at Articulate training told us that it's best to change the audio settings to custom and up the bit rate to 32 in presentation options, so I changed that.

When I went back to make sure the levels were good between the audio for the presenter slides and the audio for the engage slides, the audio for the presenter slides was gone. Completely gone. There is no audio for any of my presenter slides at all. I have not changed any of my file names or locations. Where has my audio gone? PLEASE tell me I don't have to re-record all of the audio for my course! Someone help me before I cry!

Thanks for any advice you all can give!