Vicky,
I would just like to say that this locum could have explained things a bit better, but was probably, clumsily, trying to play "Devil's Advocate" (by telling you all the risks associated with C-section). This might not have been done to sway/change your mind, but to make you fully aware of the risks involved with (what is inarguably) major abdominal surgery and the associated risks of anaesthetic too. The doctor HAS to make you aware of any/every possible risk because if s/he does not, then you cannot properly consent to surgery, "Informed consent" must be given by the patient. This means that the patient must be made aware of the possible risks (as well as alternatives to surgery) before agreeing to go ahead.
We are all fraught with anxiety about birth as it is, without being told about the things that might go wrong. I'm not suggesting that you are over-reacting, or that the doctor couldn't have been more sensitive to your feelings (or have expressd herself better), but I just wanted you to know that she was probably gearing herself up to book you in for a C-section before you stormed out. She just wanted to make sure she covered every possible ground first (esp. if she's a locum).
What you have to do is to take a deep breath and remind yourself that there is no emergency. You and your baby are not (at present) in any kind of danger. It's natural to feel scared and anxious (esp. if you have something to focus on, like the baby being breeach), but it's only if the baby is in a transverse lie (not breech) that the situation is as serious as you fear. The hospital are aware of your baby's position. They are aware of your views on the matter and it is therefore unlikely that they would put you or your baby at risk.
I'm not suggesting that they have altrusitic reasons for not putting you at risk (that they care about you or your baby), but all medical professionals practice defensive medicine: if nothing else, they won't leave themselves open to liability if anything goes wrong! Rest assured, they'll get your baby out of there on time!
I'm worried too. My baby has been in a transverse lie for a few weeks and already my m/w is fretting about it (and I'm only 28 weeks). Have you seen this site:
http://www.spinningbabies.com/
I hope you get to talk to someone soon and get a date sorted so that you can stop worrying. Good luck.
xxx