What Causes Excessive And Persistent Bleeding During Menstruation?

good morning. im on the petogen injection sins November 2013. a month ago i start bleeding. the first week it were heavy and sins then the bleeding never stops. not much per day. and my kidneys are paining non stop. the next injection i were sepose to take was on the 17 july but im scared to use it any more. is it save to use the petogen any more