Anyone out there taking Tamoxifen? I been taking it for a week, and my hands are killing me. Mostly my thumbs. I read 'joint pain' as a side effect of tamoxifen, but this does not seem to be joint pain exactly, just a radiating pain from the base of my thumbs up through my wrists. I am working very hard in the yard. It is conceivable that I hurt myself, but seems odd it's both thumbs. Just curious if anyone else has had this.