S.W.
See your doctor or get another OB/GYN. You may wind up with a hysterectomy if they cannot get the bleeding stopped. There maybe other underlying issues that may require surgery. We are not doctors here and cannot give you helpful answers for your condition(s).
I am sorry you are dealing with all of this and the amount of blood loss. But do what you must to take care of your life and health and for your children.
the other S.
PS I had something similar and knew at my age 43 that I did not want any more children and was ready when I had my surgery. It has been a godsend and I don't miss Aunt Flow in the least. My doctor said I looked better after surgery than I did prior. Gone were the dark circles under my eyes and I got my energy back.