DIM INSTEAD OF EXEMESTANE?

Hi, Everyone:

Hoping you can tell me if anyone is taking DIM instead of Aromasin?  Getting tired of the myriad of side affects.  Currently in year 2, 3 more to go, according to my oncologist.  Considering taking DIM instead.  I eat broccoli, do other things to limit any estrogen, as my BC was 100% estrogen receptive and only 10% progesterone receptive.  

Any suggestions are much appreciated!

Monika