Fire the geneticist. Your genes can't tell if you're at risk for any cancer. They can only tell if you'll have a greater risk than the average human. Acting on anything found by your genes at this point is just stupid at best.
The major breast cancer genes give the patient somewhere around an 80% chance of getting breast cancer, which in my book is close enough to certainty when death is a possible outcome.
However the associated chance of ovarian cancer is only around 50% which makes for a much harder choice for a younger woman, as having your ovaries removed would cause immediate menopause, with its own serious life changing effects.