I've had a stressful evening, so I've come here to read and relax.
You have a signed delivery notice, so the issue isn't anything that you have done.
Think of it as an opportunity for a better story to tell your grandchildren in 25 years.
This whole process is stressful and nerve wracking enough when everything goes right.
Breath in for the count of three, hold for three, and out for three. Repeat three times.
And with the idea, that it's better to laugh than cry, I leave you with this joke:
Having sex is like playing bridge. If you don't have a good partner, you'd better have a good hand.