Perhaps you need to speak to someone about your last labour and birth, get hold of your notes and run through them with a MW/doula and understand what happened a little better - that way you can start to come to terms with it.
I have seen a counsellor and gone through my notes with a senior MW to help me try to come to terms with it all. I'm going to start using natal hypnotherapy with has some exercises to help you let go of bad feelings around previous births perhaps something like this would help you be able to make decisions a little more easily.
have you spoken to your own MW about your feelings she may be able to help. I laboured in our local BC and it was wonderful - ended up in hospital with an EMCS so am going for a HB this time as I'm not allowed in the BC and I know I wont relax in a hospital.
Only you can make the decision, but get some more info about what happened last time and go see your local birth centre too - they can be great so much nicer than a hospital with the reassurance of more available help than home if thats what you worry about.