I took 1mg of Arimidex on Tuesday night, tonight I am having hot flashes and big time insomnia. It is almost 2am. The reason I took 1 mg is because I overdid Nebido and was concern about a spike in estrogen. The result is that I am having symptoms of low estrogen. How long does it take before it comes back to normal? Logic would tell you to add more test but I am reluctant to do so.