1.Unfortunately, Prozac, Paxil, and "minimally Zoloft", are belived to interfere with the effectiveness of Tamoxifen. I know it's hard to consider switching from an antidepressant that is working for you, but if you want to go back to Tamoxifen, Lexapro, Celexa, Effexor, and "probably Wellbutrin" could be other choices to try.
2. As you probably already know, Tamoxifen and the aromatase inhibitors work in differerent ways.