Pp complications?

Ka
Just curious if anyone ha had pp complications lasting multiple months after birth? I gave birth at 30 w in September. In movemberbeh finally discovered I had retained placenta and had a d&c. I've still been feeling off, and have had a bad lower back ache and cramping the pasts two days on top of constant stomach issues. My milk never did Coke in strongly so I supplement and pimp enough for a bottle or two per day after breastfeeding. Hoping to get a second opinion from another dr, didn't know if anyone else had longer lasting complications though or any ideas?