Yep - fear of the unknown is totally correct - but don't get ahead of yourself, either. This disease mucks with your brain even MORE than your body, I reckon! :( As most of us were fit & well & had no idea it was even there, until it was found ... and then it all hits the fan!
Re hormone treatment - in the old days when there was only Tamoxifen, it was pretty standard treatment to have a full mastectomy followed by 10 years of Tamoxifen .... But now, the more usual treatment is lumpectomy (altho there are many who still need or choose to have mastectomies) and either 5 or or 10 years of AIs (Aromatase Inhibitors/hormone suppression.) Mine was supposed to be 5 years but I asked my Onc if I could go for another 2 years & she said yes, but no more. (It is really all dependent on your BC type, tumour size etc) .... so I finish my Meds this time next year.
take care x