Thanks for the query.
After undergoing surgical abortion
some amount of pain in back, cervix
etc are common due to the instrumentation during the procedure.
But as your symptoms restarted and as you have undergone D&C twice, better to rule out the possibility of infection.
So you once consult gynecologist, get examined and go for ultrasound
to rule out any possibility of infection. If nothing is there you can take symptomatic treatment.
For more details you can ask me through: http://www.healthcaremagic.com/doctors/dr-sree-gouri-sr/63429