Arimidex (anastrozole) VS Nolvadex (tamoxifen)

I start my cycle 5 week ago. a day ago i was tender near the nipple so i dont take risk for the bitch tits, i start taking arimidex.

My question is can u take arimidex all ur cycle? and can u take arimidex all cycle + PCT ? cause i know nolvadex is good for PCT and even for all the cycle.

thank and sorry for my bad english