I have just started Tamoxifen after being on various other treatments. I have been on it just under a week. Does anyone else have a sore mouth and cracked lips? Also I have had 2 night's not sleeping at all. These side effects do not seem to be on the list they gave me. I am seeing the breast care nurse this week so I will mention my problems and see what she says but would be interested if anyone else had had these problems. It feels a bit like being on chemo again!!