Absolutely Minka - having a good relationship with your Onc is paramount. My first Onc was useless - and was very dismissive of anything I said about side effects - I changed Oncs, she listened, I changed AIs twice & the the 3rd one was the one that suited me - I was on it for over 6 years. ;)
Erika888 How are you going? Have you started yet? Give it a few months, at least to see how you go! Ask your Onc about 'starting slowly' - taking one every other day, at the start? Not everyone gets side effects and I hope that you are one of the lucky ones!! But if you do - ask your onc about switching to one of the other 3-4! The only one I ended up NOT trying, was Tamoxifen!