The GFE is not a pertenant document for the Title Company, the Seller or the Lender:
Many Buyers do not even get a GFE.
It will not stop anything.
What you should be concerned with is the FINDING for the Loan;
will it be in place for the Escrow to close?
The procedure would be to have a Contingency, (17 day, 21 day, 30 day) for the Loan, that would allow you to back out if you couldn't get the loan in place.
If you are having problems, you would file for an extension with the Sellers.
If you do not have the loan in place, have no contingency, and the Closing Date is here, then you are in trouble and may lose your Deposit and the house.
Your Realtor should be helping you with this, representing and protecting you.