I was just getting ready to suggest that!!

Also look under style picker in "Recent Styles" and that will show you the style you were using, if that has not already been suggested.
Always save all mgu or sgu files in different versions and backups to a folder specifically for those files.
Also, did you search computer for the BIAB file? If you did not DELETE it it is there somewhere.
Save your first version and your last and take a screen shot of the style in case something goes wonky later if you change computers.