When your doctor/s say they tried everything, did they try these? The first has been around for quite a considerable amout of time.

Surgical control of haemorrhage

This is a 100% effect procedure for stopping postpartum hemorrhage with out resorting to hysterectomy which has been around for about 10 years. When I asked my doctor why they had not tried it I expected them to say he did not know of it. He said it’s not a procedure that we use! So if they HAD decided to use this procedure, I may be carrying our third child by now! (2003)

http://www.radmid.demon.co.uk/pphemergency.htm
surgical control of haemorrhage without hysterectomy
Thanks to Angela.

Balloon used to stop haemorrhage

The following procedure is about 80% effective.
A balloon is used to stop haemorrhage without hysterectomy
http://healthlink.mcw.edu/article/954376188.html
With thanks to Bonnie.