I'm sorry to hear you're feeling so low, and realised that you haven't had a response to your post. I know it's a few months on and you're probably in a slightly different place now, but I totally related to your post. I too have had masectomy, Rads, and am now on Tamoxifen and hate it. I was diagnosed in July 2012, and have been on Tamoxifen for 16 months now. I thought the side effects would have got better, but I still suffer with hot flushes, nausea, fuzzy head, feeling low. I am desperate to stop taking them but not sure if I should. I have two young children too, and I've just started a teaching course, and wondering how on earth will I manage a classroom of kids feeling this crap. Anyway hope this post helps you feel you're not alone.
I was diagnosed October 2012, I have had a mastectomy, chemo and radiotherapy. I returned to work in June and I was over the moon as that had been my light at the end of the tunnel. I'm taking Tamoxifen, which I see as the enemy. An evil substance that is inducing menopausal symptoms. I am 49 so was not expecting to have any more kids but I am grieving for the loss of my ability to do so. I have awful moodswings, am really horrible to my husband and kids, I have put on weight and am suffering severe cramp in lower legs and feet at night. I am finding it so difficult to motivate myself and at the moment I am feeling as though I have nothing to offer. I have no real ambition or zest for life. I am not suicidal but I am really asking myself "What's the point?" Other people in my life both personal and professional are making plans for the future but I swing between feeling envious about this and feeling that there's no point in doing this because I'll probably be dead before I can achieve things. Feeling tired and beaten and totally past it.