So sorry you still have pain. It's a tough decission to make, pain or chance of more cancer. I am leary of quitting the letrozole but the side effects are not good for me. I wish you luck with whatever choice you make.
This is what worries me about starting AIs in a week or so. People say that you might as well try because you might not have the side effects and others say they stop when you stop taking the AIs but I'm still badly affected by the Taxol 3 months later and I'm just not sure about risking it.
Hope you feel better soon.