Topic: LCIS & other dx

I'm 40 and a single mom of a 4 year old son.  My mom's mother died at a young age of carbon minoxide(sp?) inhalation before she was 40, we don't know if she had any type of cancer.  My dad's mom had uterine cancer, my dad's dad died of bone cancer and my mom's dad died of lung cancer.  My cousin, although I know that's not a direct relationship has IBC.  I also had dense small breasts to begin with.  I had Complex Sclerosing Lesion (Radial scar), LCIS, Focal Atypical Ductal Hyperplasia, Columnar cell change, Apocrine Metaplasia and Sclerosing Adenosis from a mass over 5cm in my left breast last year.  Since then had a 4cm mass in my right breast which was Sclerosing Adenosis, Columnar cell change and Apocrine Metaplasia.  Then this year another right breast mass (3.5cm) was Stromal fibroplasia and Granulomatous reaction.  And recently in my left armpit a mass which the Dr. suspected was an enlarged lymph node; was 3.5 cm and was lobules of adipose tissue.  I've searched, and seen multiple doctors.  My gynecologist, oncologist and a surgeon have recommended a bi-lateral mastectomy.  They say an invasive cancer will show up in my right breast.  I'm really scared to have a mastectomy done, but also terrified that if I don't I will develop an invasive cancer.  Anyone out there had these fears?  Any advice, thanks.