I have had an epidural before and I too got back pain afterwards. I still have pain in the lower back area and after speaking to my, Pain MAnagement Doctor, he said I could have something called 'Remembered Pain' which is where the nerves can still remember how it felt whilst having the epidural. When my mum had me, she had an epidural also and has the same type of pain as me. My doctor said it's quite a common complaint after epidural etc. I hope you feel better soon and I'm keeping you in my thoughts.