Can't have an epidural - advice?

Am

I'm on my third pregnancy, and after having 2 induced and extremely painful births in the past, I'm faced with the feeling that I can't go through with the pain again! I can't have an epidural as the last birth proved after 5 attempts to site one, it's impossible. The first birth I had I was high on pethidine and the last one I did it on nothing at all.... The gas and air does nothing!

Has anyone been told they can't have an epidural sited? What did you end up doing? I'm assuming I can't have a spinal block either due to my back. How did your birth go? Was it a cesarean?

Thanks ladies X