I had the same thing but it went away after a few weeks
I also had my baby on the 3rd. And my spine is pretty sore. My birthing class teacher told us that sometimes you can get what they call a spinal headache. Its just from the epidural.
Some women get side effects like that and some get them for a long time my sister and bad back problems for 9 years. Its all part of the risk
I had an epidural but it was so long ago that I don't remember having after effects but I was also in the hospital for 5 days. I had a c-section. I imagine some sensation may be normal as an after effect but I'm not sure. Instead of waiting to see the doctor, call the office and ask to speak with him/her and find out if this is normal or not, don't wait