If the changes were edits to existing files, they are removed from the files and you cannot retrieve them from there. Your IDE or merge program might have backup files of an earlier state of the files.
If the files were now, untracked files, you might be able to undelete them.
You may be able to recover some of the changes in your staged files:
According to everything I've seen, there's nothing to do that's native to Git or SourceTree for files that were never staged to begin with. Maybe you have other software that created a backup (OS, IDE, etc).
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