Change not saved, file lost

Hello,
We're using Sharepoint 2013 to manage documents. I was editing a Sharepoint doc in excel and saved my work several times before finishing, however I did not check the doc back in upon completion. Instead, I created a PDF version (makes printing easier),
saved the PDF file to the same Sharepoint folder, and checked the PDF version in when I was done with it.
When I went back to the library to check in the excel version of the file, it was showing an older version of the document (from last night). I opened it, and lo and behold none of the changes I had made prior to converting the file to PDF were showing.
What happened to that file? Like I said, I saved it several times before converting to PDF, yet no copy of the changes exist on Sharepoint or locally. I disconnected from the network, opened excel locally and checked recent documents - it wasn't there. I checked
my Sharepoint recycle bin - not there. Versioning and publishing are enabled, but I was the only person working on this document. I searched the entirety of my hard drive - not there. I checked the version history - not there (last night's version is the most
recent).
I've done this before without issue. Both files (excel and pdf) would show up in the Sharepoint library with all changes. I'm at a complete loss on this and would love/appreciate help in recovering the excel version with all my changes (otherwise I just
lost 6 hours of work)!
Timeline of events:
Last night@7:16PM - Save and check-in excel file.
This morning@8AM - Open and check out excel file. Make changes and periodic saves along the way.
Today@2PM - Finish changes, save, create PDF, save PDF, check in PDF version. Go back to library to check in excel version only to find that the version from 7:16PM last night is the latest excel version available.
Regards,
KMS
EDIT: Sharepoint 2013, Office 365, OS: W8.1/64

Hello Cam,
Interesting. I'm sure nobody went into site settings and discarded changes.
I hard refreshed the site; file still not there.
I'm beginning to think it's IE11. I'm using 64-bit, and don't know how to use the 32-bit version (I'm not very savvy when it comes to this stuff). I have found a few tutorials online but I'm not sure I'm doing it correctly.
I appreciate all the help so far, Cam. At this point I've spent so much time searching for a solution I could've just redone the work! Ugh.
EDIT: Is it possible that I accidentally discarded my check out and therefore all my changes to the excel doc went unsaved? If so, wouldn't the fact that I saved my work several times prevent me from losing the changes? I'm so confused at this point!
It's odd that I have a PDF version of the document that shows ALL the changes that I made - essentially the finished product - and yet the excel document from which said PDF was created is gone!

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