Hi unyummy, I have just been through similar, had a c-section last week at 40 + 1 after being gung-ho for VBAC for 40 weeks (and in fact every single day since my previous section!)
I opted for the section in the end due to some symptoms of pre-eclampsia that made it very hard for me to stay positive about VBAC, plus hospital were getting itchy about inducing me which was something I didn't want at all.
The 2 days leading up to the section were really odd, I sort of drifted around the house half-doing little jobs and staring at books/TV without taking anything in! My poor DD bibbled away as usual and I just stared vacantly at her. Every little twinge brought hopes of natural labour. However around midnight the night before, I found myself feeling pleased that I would see my baby soon. Also I had to be nil by mouth and REALLY didn't fancy labouring that way! So there was a strange mental shift to "I hope that WASN'T a contraction!" after weeks of trying to gee them up.
The section itself was in fact wonderful. I had hoped that a VBAC would help me to come to terms with a previous section that didn't go well. What a wonderful surprise to find that c-sections are all completely different, just like vaginal deliveries. This one was so peaceful and happy, and the aftercare was/is gentle and thorough. I am on such a high. The fact that I went overdue (even just 2 days) means that I can say, hand on heart, that I gave VBAC everything I was prepared to give until a section became the right thing to do. I feel as though a lot of ghosts have been laid to rest, and it is truly wonderful to have a baby in my arms.
I never did work out what to do about the endless "Anything happened yet?" requests, beyond keeping a sense of humour. My personal favourite was an aunt who told me "You love stringing us all along!" yes auntie, it was great fun keeping everyone guessing!
Chin up chuck, whichever way it works out it will soon be part of the story of your baby's arrival and you will be feeling very proud of yourself to have endured it.