What causes a burning and tearing pain in the pelvic area?

I had surgery last year to remove my left fallopian tube. It had "torsion" in it and the doctor was afraid it was going to rupture. I also had some adhesions. They didn't know why I had those but I did. Ever since I had the surgery I have these pains in my left side that feels like something is tearing or ripping apart. It also burns and it is tender to touch. It usually happens close to my period. What causes this type of pain?