The dead arm thing may be related to some of your other treatment. Surgery and radiation effects can change months and even years later and I had a lot of trouble with my arm after radiation but this was also when I started tamoxifen. Both the radiation oncologist and the medical oncologist have thought that my issues are from the radiation not the tamoxifen. I have had physio and now am doing Pinc Pilates and have had a lot of improvement. If you having the same effect from different medication it might be something else causing the problem. Hope you can get it sorted. Deanne xxx