I have had natural births for my first 3 children and 6 weeks ago I gave birth to my daighter via c section.

I have severe back pain, so much so that I have had to ask my partner to stay off work so he can do the majority of child duties. I have taken all the pain relief I can and still no use. I have lay on the floor overnight to stretch my back not worked. I have a doctors appointment but before I go see him or her just wanted to know is it normal? Or is it unrelated? I had no complications post c section, scar healed nicely, waant in loads of pain.