Chanel,
You are correct, Tamoxifen, Arimidex and a few others all do the same thing, they are to protect against Cancer in hormone receptive Cancer. My Oncologist said that taking the medication after all treatment is like putting a lock on the door so to speak...to make sure it never comes back.
My recurrence actually left my Breast Surgeon gobsmacked he said its unexplainable, one of the elitest in Melbourne, there were NO reasons for the recurrence unfortunately. I have ER+ only, I had aggressive treatment, lumpectomy, clear margins, no node involvement and tamoxifen 4yrs. I was put into like a 2% risk of recurrence...just plain old bad luck basically. That is all.
So Chanel, I say to you, absolutely your Medical Team are the ones to listen to, I have no regrets at all, and as much as I don't like Arimidex and the side effects, Im taking it. Honestly, for me, in the scheme of everything, its super easy. I believe you'd be absolutely fine on Tamoxifen.
Hugs
Melinda xo