can arimidex cause fevers to go in the 100's or to 102.3

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i was put on a pill called Arimidex could this be what is causing my temp to go higher? i also get stiff neck and neck pain. i am 71 female and overcame HER2 Positive Breast Cancer with chemo herceptin and 3 others types of chemo and surgery a little over a year ago as in they removed the cancer cells but i still kept both breasts but now what i am noticing every single day is that i keep getting temperatures in the 100's or higher 101.4 or 102.0. i have had all sorts of tests and blood work done to find infection but they can not seem to find out or know what is going on with me, i had a pet scan over a year ago when i 1st found out i had breast cancer to make sure it did not spread, thankfully it did not spread at that time and as far as i know i am still free of cancer, but these high temps i am getting every single day is worrying me to no end.