I have been taking tamoxifin for only 1 month and have put on 12 pounds in that time. I'm eating less because I frquently feel ill. I've had a partial mastectomy and radiation treatments. Lucky me even gained a few additional pounds during radiation. Having been small my entire life(I'm 55) weighing around 105 - 110 I'm very unhapppy at 124.I have never dieted before so this is a first for me. I exercise regularly and walk twice a day for 30 - 45 minutes each time. Nothing seems to helping. What can I do?