I had cold coagulation for (cin) cervical intraepithelial neoplasia, I have bleeding since that day?

Hi my name is (…) I am 25 years old exactly 11 weeks ago today I had cold coagulation for (cin) cervical intraepithelial neoplasia 3 on my cervix I have bleeding since that day I finished my contraceptive injection one week ago aswell
I have bleeding every single day for 11 weeks solid it’s has been pink red and brown I’ve had some cramping some back pain but there isn’t a pattern sometimes I can stop for a few hours then it starts again last week was the heaviest it has been and now it has turned back brown and black blood
I do t know what else to do I’m not in any pain now