I am not a doctor, but I cannot believe this GP has advised you to stop your tamoxifen without consulting your oncologist...and has he tested you for the bacteria which commonly causes ulcers? TreAtment required? some antibiotics? I really hope you've been able to get onto your oncologist. If not, perhaps call the oncall oncologists at your treating hospital (assuming you had chemo) ... I found the ones at RPA excellent for answering concerns re niggles at times over what was happening during treatment. I wrote it before and I'll write it again. I can't believe your GP has told you to stop tamoxifen without consulting with your oncologist first, or testing for the bacteria which I can't currently recall how to spell! It's heptisomething pylori . Hope this helps guide you to a second opinion and the right treatment. Perhaps it is the tamoxife, but unless he's ruled out the other (far more common) possibility, telling you to stop tamoxifen is dingbat crazy on their part. You know what I've found most exhausting about BC? Not the surgery, not the chemo, but the emotional and intellectual energy required to stay on top of what some of my health care providers are doing, and occasionally doing their job for them. I could regale you with all the things I've had to correct, prod them to do, etc but will save that for another post! Hope you feel better soon and treatment ends up being as simple as popping some antibiotics. Have can beautiful day x