I have tried isolating what foods might cause my stomach upset, but it does not appear to be consistent with any food (except possibly fried chicken). I have diarreah at least 3 nights each week usually starting between 2:30 and 4:30 a.m. (I take Arimidex at supper-time), In addition I have had a few dizzy spells (lasting several days), my skin stinging when I get too hot, and hot flashes. Otherwise, I feel great. I have been taking Arimidex for over 8 months now.