I was back to back too and my back has been in absolutely agony since. I get a shooting pain that goes down my bum cheek in to my leg. I had an epidural also.
Have you tried a belly band? My pregnancy one is able to be worn that way (almost like a girdle) it helps to pop everything back where it should be while you wear it and give more support xx
Did you labour in your back? I feel the same, no epidural but really laboured in my back this time and it kills sometimes 😩
Do you need to be going to the supermarket? Sounds like you're doing too much too soon. Get an online shop or send your husband. Or tell your aunt she was right and ask her for help. Rest!
My first was back to back and it took months to get my back to normal. I did have epidural though. Normal unfortunately