Thank-you for taking the time to reply to my panicked message, hinky
I can't talk to my DH about these concerns because he practically rolls his eyes out loud (as I worry, always). I can't ever get a reliable answer out of my DM: everything is compared to Victoria Beckham and her 4 CSecs 
To cut a long story short, I damaged my tailbone during dd1's birth. It was agony: I couldn't sit or stand without pain; i started getting sciatica and so 4m after her birth, I had 6 sessions of private physio to help sort it out. The physio suspected I'd also slipped a disc although therenis no proof of that as I didn't have an MRI scan.
It has got better but 6y on I still can't sit directly on my arse (I perch on either one of my cheeks!) and cannt move my legs in certain ways without feeling a pull on my tailbone.
I was terrified of giving birth vaginally in 2012 in case I did more damage; felt it 'go' again during the birth and then wouldn't want to push. I felt the pain in 2009 but as I didn't know what it was, just kept pushing for 2 hours (Dd1 was delivered by ventouse in the end as she was stuck crowning for 2hrs).
So, upon telling my consultant all this when requesting the CS, he was very unsympathetic as there was a chance I could VB again and not do more damage. The stuff he was telling me about CS was bleak, but I informed myself/saw an independent chiropractor who said I was at a greater risk of damaging/making the tailbone injury worse ... so I went with the different but more predictable risks of ELCS.
He was an awesome surgeon in the end but the thought of risks to future pregnancies got into my head yesterday.
You're right, though. If dd2 had been breech and I'd had a CS, I don't think I'd be thinking about this so much. Responsibility sucks sometimes!!
Thanks 