Hi there, my IDC was diagnosed late 2019 stage 1 but they did the oncotype test with the tissue and strongly recommended radiation, chemo and then aromatase inhibitor. I was really shocked to have to do chemo but only for 2.5 months.
The oncotype test helped convince me to do chemo.

I have been on arimidex and do get some joint pains, sometimes i need to wear a brace on my left ankle due to the pain there which allows me to walk better.
There are other aromatase inhibitors I’m told so yes talk to your oncologist about your side effects and maybe try another one. I’m told to get to the 5 year mark with AI and I’m almost 3 years in. Anything to keep this awful disease away.
I wish you the best on your journey, for the best outcome. 😊