Have you had an ultrasound? (Sorry if you mentioned it and I missed it.) I bled for 9.5 weeks at the time I was 38, had an ultrasound which showed a fibroid tumor and cysts on both ovaries. The hormones they gave me slowed the bleeding down, but it didn't stop. I was hemorrhaging when I called my doctor and she said she'd meet me at the ER. Once there she determined i need a D&C, I had it, and when I was back in my room (they hospitalized me) she told me what she had seen indicated I needed an emergency hysterectomy. I had it the next day and went into instant menopause, they couldn't salvage either of my ovaries.
My advice is to talk to your doctor, ask for an ultrasound, have the D&C as it sounds as if it's needed, but don't assume it will just end the bleeding, there may be something physically going on that is causing the bleeding and needs to be taken care of.
God bless.