Years ago I was prescribed Tamoxifen following a mastectomy. I had miserable side effects and so my meds were swapped around. After 6 months on Tamoxifen, I was changed to Arimidex which gave me different side effects. When those became too much, I was changed onto Toremifine, and eventually back onto Tamoxifen.
After 4.5 years of miserable side effects, I was taken off all medication. This was 28 years ago and I have been clear of cancer since then, so the drugs did their job, and probably medication regimes have changed since then.
Do speak to your consultant, Lemonnutmeg to see what can be done. I wish you all the very best. 