After I had my twins (by C-section) I had back pain for about 5 months and also, my feet would go numb in the morning...so it would take a while to get out of bed (without falling over)...my Doc told me it was totally normal, and could take up to 2 years to feel totally normal again....but like I said it was only about 5 or 6 months.
I've had tons of back pain since my c-section. The epidural lost effect twice before I ended up getting a c-section, so I also have pain in my hips. I'm never comfortable unless I'm sleeping on my back these days.
It could be permanent or it could be temporary..it is most likely from the epidural. My son is 5 months old and Im still having back pain..I also have back spasms (nerve damage)..I hope it gets better, but there is no way of knowing. I know a woman who had a epidural 10 years ago and still has pain associated with it.