Hey @SalfordSilver .
I appreciate that you have added the link to your store as that is super helpful. I’m sorry to hear about the trouble you are facing, let’s see what we can do to help.
If you recently have made a coding change on your theme that caused the Header to no longer display. You can roll back to an older version of your theme. If you would like to revert the changes, you will need to navigate to Online Store > Actions > Edit Code. I took a screenshot from my test store to show you the section I am referring to:
Once you are looking at the coding of the theme, you can then select Older versions of your theme to have the changes reverted to an earlier date. If you noticed a purple dot next to the files, that means changes have been made to the template and you should be able to revert the changes made.
Let me know if that fixes the issue.