If you still have the QR code or the time base mode code saved you should be able to set it up again on your Gauth app. Unfortunately if you don't have them anymore and you are still not able to recover your Auth code you will need to open a ticket in the Lost Auth department to have your Authentication reset on your account.
If you are having a trouble opening a ticket, you may private message a volunteer here on forum and ask politely to help you open a ticket in Lost Auth help topic.
Include your registered username and ID in the private message.
And lastly, please be reminded to not post your personal information such as your email address for your privacy and security reasons.
Good day and good luck