What Causes Persistent Abdominal Pain After Taking A Depo-Provera Shot?

Hello DR. I had laparotomy surgery on my right side last year in October. Three months later (in March 2016), i went back for review and my GP advised that I have cystic mess developing on my left side. He put me on depo-prover to monitor the development of the cystic mess. A week later following the depo-porvera shot, i started having continuous bleeding for a week followed by 3-4 weeks of brown discharge and then would stop for 5-6 days and start again. The last period i had was with thick blood cloth and brown discharge for a week. It stoped in early July 2016. Though i am not bleeding, i still have abdominal pains. The pain can last up to 24 hours. I am very worried and need help. Thankyou El Dablieu.