Epidural

I had my 4th baby March 28th, and I got the epidural all 4 times. When the lady numb my back when getting the epidural I felt a big sting in my back with pressure and it was very uncomfortable and on top that it didn’t work all the way when I was in labor. Now my back hurts in one spot but not where she stuck me at it feels like I pulled a muscle there and it’s sore, and I still get little back pain standing for to long. Has this happen to anyone else?po