You can try with oral iron to stay ahead of the blood loss with Ferrous sulfate, Ferrous gluconate or Ferrous fumarate all sold OTC. If pelvic US shows uterine fibroids which can be extensive and not amenable to cautery then surgery is still an option because this is not another open heart procedure. Granted it is a big operation but they can always give several units of blood to get your hemoglobin up a little prior to a surgery. The aneurysm is likely stable so not a contraindication for an elective procedure however obtaining a cardiac clearance might be necessary but doable. Trying to stay ahead of this may be too much of a quality of life issue with hormones, iron, vit C and avoidance of platelet inhibitors like aspirin and NSAIDS and removing the IUD. Being in Medicine for quite some time i try to avoid pushing people for surgeries but this may be needed and not too difficult with the right GYN and cardiologist to coordinate this for you. I pray for you and wish you well!