1mg Arimidex daily is a MAJOR dose!!!! most start on 1mg weekly. I personally was on 2mg daily at one point before I realized that I was simply overcompensating for a thyroid/cortisol problem.
be very careful as some people overreact to arimidex and can suffer severe consequences.
what was your Estradiol levels, or did your doctor just prescribe it without knowing what your blood tests levels looked like? If no tests results, I would recommend that you seriously consider finding a new doctor as this one is potentially putting your health at risk.