@WhiteLight
It's a so and so when the body says I don't like this and there's a lot of side effects!
Your Oncologist will guide you along and yes there are other Aromatose Inhibitors to try!
I am coming up to 10 years next year, thank goodness- I have been on Tamoxifen, Letrozole, Aromasin and back to Tamoxifen.
I personally think it takes time for the body to adjust and this stint on Tamoxifen for me is just the normal bone pain, which I had with all of them otherwise it's a countdown to the end of taking them.
Take care and know that we all have different reactions and hopefully your body will adjust if you are given an alternative
Best wishes