Aromasin and chemo

I began taking Aromasin 1 year ago for advanced (Stage 4) BC with mets to the bones. I have increasingly had severe joiont aches, my hands and fingers ache so badly at times, I feel I can barely hold a book, or type, etc. My hands and fingers tingle and feel numb. I also have severe wrist pain so much so that I sometimes use a heating pad for some relief. I do not wish to discontinue it because it seems to be working and my Oncologist says the side effects are more tolerable than chemo, which I have already had before. I feel like my Dr. sometimes thinks I am exaggerating my pain levels, but I struggle with daily activities. I am on Fentanyl patches and even have to resort to Hydrocodone when it becomes to intolerable.