This is why it’s important to make backups. If, by any chance you printed your disk configuration before the gpt operation, you want to copy it into a notepad NOW. You can use that to try and recreate your original partition layout after converting the disk back to MBR. Chances are nothing is wiped, except for your disk configuration. No guarantees, though…

Whatever you do, don’t format anything, as that WILL overwrite your data.

You need some ansible love in your life!

TACO!