More likely to be general end of pregnancy aches I think! No idea about how likely it is that baby will turn although if you google you will find ways to encourage it to turn - hands and knees seems to be a popular one!
I had an in diagnosed back to back baby when I had DS, and although it's my only experience of labour it doesn't feel like it was any more painful than friend's have described their labours as being. The main difference was that I didn't experience separate contractions it was a constant level of pain (felt like incredibly explosive diarrhoea pains) which was tough at first as I expected pain in waves. This apparently happens with a lot of back to back labours but not all.
I coped on gas and air despite normally having a very low pain threshold but I think it helped that I had a relatively short labour (under 10 hours from first twinge to first breastfeed )