So glad I have found this forum. I have come off Tamoxifen in the last few months after taking it for 10 years. Would have happily kept taking it as I had no side effects taking it and felt it was protecting me but now I seem to have lots of the side effects that I am reading on here. Tired and exhausted all the time. Brain fog and no concentration. Joints are aching. Seem to have ache or pain across my chest and under arms. My right breast I had mastectomy and reconstruction a couple of years later so wondering why l would find that breast with ache or pain. It’s like I’m waiting for cancer to return after coming off tamoxifen as felt safer taking it. Have thought of talking to Doctor about my aching chest but probably bit embarrassed in case they think I’m making it up. I’ve also got lymphedema in right arm. Maybe it’s my age. I am 60 and working two jobs. Thank you to everyone who posts their symptoms. It certainly reassures me I’m not on my own.