Just bumping your message as I noticed you hadn't received any reply in case someone missed your post and also suffers from back pain while on tamoxifen.
I also wanted to add that we do have a team of nurses that you can call to talk to if you think that might be of help at any point. They are available Monday to Friday 9am to 5pm on 0808 800 4040 (free to call from a UK landline).
