No, you can not sleep peacefully through the night.
Yes, you can be turned down a few days before closing.
No, nothing is guaranteed, regardless of how positive the loan officer sounds.
Of course you should be asking these questions of your loan officer, not strangers on the internet.
Yes, we know you submitted all the stuff, that however has no bearing on when the underwriters will LOOK at your stuff. Stuff like too many non-reimbursed business expenses has sent many deals to the bottom. Sure, it was plain and easy to see from day one, but the issue is 'when' they choose to look at your stuff. Usually, the bank/lender is the LAST one to spend money and resource on your behalf. That is why lender failure most often occurs AFTER the buyer has spent their money on inspections, appraisals, surveys and consultations and just days before closing.
This is why it is essential to use the lender recommended by your REALTOR. In that relationship there exists ACCOUNTABILITY. A lender who drops the ball, at the end, finds themselves OFF the list. That is real accountability.
Always have a Plan B.