Anastrozole: Any studies on its side affects?

I want to know if there is anyone out there studying the side affects of anastrozole. I've been on it now for almost three years and I've read multiple discussions. The first symptom was the pain in the heel. It was so irritating to have people respond it's plantar facetious. No it's not!! Then I had swelling and pretty much unusability of my pointer finger. Next was my thumb on the same hand. Swelling and severe pain. Next came a stabbing relentless pain under my scapula and then out of nowhere my knee started hurting. I am a very active person and if I can't get out and take a walk then is it worth it. Is there anyone looking into the biological results for this pain? Is your blood different are there brain changes that come with these side affects. There has to be some answer as to why all these people have almost identical disabilities. I just don't understand why there is not tests being done instead it's just a , yeah that's one of the side effects. I went off for a week and no pain in my shoulder, swelling in hand almost gone, (my heel pain went away on its own),knee is feeling better. I have tried but the side effect pain is terrible. These side effects don't gradually come on... it's bahmm swelling and severe pain. I want to know why!!!!