Count me among those who experienced the blues after all the active aspects of treatment (surgeries / followups) was complete. I didn't connect it to the Tamoxifen -- but that makes sense. I was in a support group at the time and the facilitator assured me that it was common to feel down after all the treatment ends and it starts to sink in that this is my life now going forward after breast cancer. I also had a reasonable amount of pain every day from the surgeries and hot flashes as well. Others in the group suggested effexor, which can be taken with Tamoxifen and has the added benefit of eliminating hot flashes. I don't love that I am taking it, but it helped immensely and I am back to my happy self. I'll go off the effexor eventually; for now I am just enjoying the even keel.

(As for diet, I was vegan before I was diagnosed [still am] I eat well and I exercise strenuously 4 to 5 x /week.)