What Do You Suggest For Severe Stomach Pain And Headaches With Period?

Hi I was due my periods last month about 2 -3 weeks ago , I have stopped my pill just before New Years . I am now bleeding just pure heavy red blood with no blood clots . I m got a taste of blood in my saliva and last night was in severe pain in my stomach and lower back . Tonight I am surveying terrible with a really bad headache and feeling very warm also , what is wrong with me ?